Training a Unet network for brainsegmentation - machine-learning

I have two questions:
Q1:
I was wondering what is the best way to feed the untet network with training data:
Sending in one patient at the time, where each volume is 160x3x192x192
Sending in random slices from k patients
Q2:
At the moment I have done the first option, but have not recieved any good results. I am getting an oscillating dice score. For example the dice loss starts at 0.99 goes down to 0.8 and its spikes to 8, and the pattern repeats. Does anyone have an answer to why this happens?
code:
class main:
def __init__(self, args):
self.args = args
self.train_loader = None
self.in_channel = None
self.out_channel = None
def _config_dataloader(self):
print("Starting configuration of the dataset")
print("Collecting validation and training set")
validation_mode = "val/"
training_mode = "train/"
collect = Get_mean_std(self.args.path + training_mode)
mean,std = collect(self.args.k)
mean_flair = mean["FLAIR"]
mean_t1 = mean["T1"]
std_flair = std["FLAIR"]
std_t1 = std["T1"]
train_dataset = MSdataset(self.args.path + training_mode, composed_transforms = [
normalize(z_norm = True, mean = mean_flair, std = std_flair),
normalize(z_norm = True, mean = mean_t1, std = std_t1),
add_channel(depth = self.args.depth),
ToTensor()]
)
validation_dataset = MSdataset(self.args.path + validation_mode, composed_transforms = [
normalize(z_norm = True, mean = mean_flair, std = std_flair),
normalize(z_norm = True, mean = mean_t1, std = std_t1),
add_channel(depth = self.args.depth),
ToTensor()]
)
train_loader = DataLoader(train_dataset,
self.args.batch_size,
self.args.shuffle)
validation_loader = DataLoader(validation_dataset,
self.args.batch_size-1,
self.args.shuffle)
print("Data collected. Returning dataloaders for training and validation set")
return train_loader, validation_loader
def __call__(self, is_train = False):
train_loader, validation_loader = self._config_dataloader()
complete_data = {"train": train_loader, "validation":validation_loader }
device = torch.device("cpu" if not torch.cuda.is_available() else self.args.device)
unet = UNet(in_channels=3, out_channels=1, init_features=32)
unet.to(device)
optimizer = optim.Adam(unet.parameters(), lr=self.args.lr)
dsc_loss = DiceLoss()
loss_train = []
loss_valid = []
print("Starting training process. Please wait..")
sub_batch_size = 14
for current_epoch in tqdm(range(self.args.epoch),total= self.args.epoch):
for phase in ["train", "validation"]:
if phase == "train":
unet.train()
if phase == "validation":
unet.eval()
for i, data_set_batch in enumerate(complete_data[phase]):
data_dict = data_set_batch
X, mask = data_dict["volume"], data_dict["mask"]
X, mask = (X.to(device)).float(), mask.to(device)
B,D,C,H,W = X.shape #
mask =mask.reshape((B*D,H,W))
X = X.reshape((B*D,C,H,W))
loss_depths = 0 # Nulle ut depth loss
with torch.set_grad_enabled(is_train):
for sub_batches in tqdm(range(0,X.shape[0]-sub_batch_size)):
predicted = unet(X[sub_batches: sub_batches + sub_batch_size,:,:,:])
loss = dsc_loss(predicted.squeeze(1), mask[sub_batches: sub_batches + sub_batch_size,:,:])
if phase == "train":
loss_depths = loss_depths + loss
if phase == "validation":
continue
if phase == "train":
loss_train.append(loss_depths)
loss_depths.backward()
optimizer.step()
optimizer.zero_grad()
print("Training and validation is done. Exiting program and returning loss")
return loss_train
Notice I have not fully implemented the section for validation, I just wanted to see how the network learns first.
Thanks!

Related

GAN generator producing distinguishable output

I am trying to train a special type of GAN called a Model-Assisted GAN (https://arxiv.org/pdf/1812.00879) using Keras, which takes as an input a vector of 13 input parameters + Gaussian noise, and generate a vector of 6 outputs. The mapping between the vectors of inputs and outputs is non-trivial, as it is related to a high energy physics simulation (in particular the simulation has some inherent randomness). The biggest dependence on the final outputs are encoded in the first five inputs. The biggest difference for this model to a traditional GAN is the use of a Siamese network as the discriminator, and this takes two inputs at a time, so for the same input parameters we provide two sets of possible outputs per training (possible due to the randomness of the simulation), so there are sort of 12 output distributions, but only 6 are unique, which is what we aim to generate. We used a 1D convolutional neural network for both the discriminator and generator.
The current model we have trained seems to reproduce the output distributions for an independent testing sample to reasonably good accuracy (see below plot of histograms overlayed), but there are still some clear differences between the distributions, and the eventual goal is for the model to be able to produce indistinguishable data to the simulation. I have so far tried varying the learning rate and added varying amounts of learning rate decay, tweaking the network architectures, changing some of the hyperparameters of the optimiser, adding some more noise to the discriminator training by implementing some label smoothing and swapping the order of inputs, adding some label smoothing to the generator training, increasing the batch size and also increasing the amount of noise inputs, and I still cannot get the model to perfectly reproduce the output distributions. I am struggling to come up with ideas of what to do next, and I was wondering if anyone else has had a similar problem, whereby the output is not quite perfect, and if so how they might have gone about solving this problem? Any thoughts or tips would be greatly appreciated!
I have included the full code for the training, as well as some plots of the input and output distributions (before applying the Quantile Transformer), the loss plots for the adversarial network and the discriminator (A for Adversarial, S for Siamese (Discriminator)) and then the overlay of the histograms for the generated and true output distributions for the independent testing sample (which is where you can see the small differences that arise).
Thanks in advance.
TRAINING CODE
"""
Training implementation
"""
net_range = [-1,1]
gauss_range = [-5.5,5.5]
mapping = interp1d(gauss_range, net_range)
class ModelAssistedGANPID(object):
def __init__(self, params=64, observables=6):
self.params = params
self.observables = observables
self.Networks = Networks(params=params, observables=observables)
self.siamese = self.Networks.siamese_model()
self.adversarial1 = self.Networks.adversarial1_model()
def train(self, pretrain_steps=4500, train_steps=100000, batch_size=32, train_no=1):
print('Pretraining for ', pretrain_steps,' steps before training for ', train_steps, ' steps')
print('Batch size = ', batch_size)
print('Training number = ', train_no)
'''
Pre-training stage
'''
# Number of tracks for the training + validation sample
n_events = 1728000 + 100000
n_train = n_events - 100000
# Parameters for Gaussian noise
lower = -1
upper = 1
mu = 0
sigma = 1
# import simulation data
print('Loading data...')
kaon_data = pd.read_hdf('PATH')
kaon_data = kaon_data.sample(n=n_events)
kaon_data = kaon_data.reset_index(drop=True)
kaon_data_train = kaon_data[:n_train]
kaon_data_test = kaon_data[n_train:n_events]
print("Producing training data...")
# add all inputs
P_kaon_data_train = kaon_data_train['TrackP']
Pt_kaon_data_train = kaon_data_train['TrackPt']
nTracks_kaon_data_train = kaon_data_train['NumLongTracks']
numRich1_kaon_data_train = kaon_data_train['NumRich1Hits']
numRich2_kaon_data_train = kaon_data_train['NumRich2Hits']
rich1EntryX_kaon_data_train = kaon_data_train['TrackRich1EntryX']
rich1EntryY_kaon_data_train = kaon_data_train['TrackRich1EntryY']
rich1ExitX_kaon_data_train = kaon_data_train['TrackRich1ExitX']
rich1ExitY_kaon_data_train = kaon_data_train['TrackRich1ExitY']
rich2EntryX_kaon_data_train = kaon_data_train['TrackRich2EntryX']
rich2EntryY_kaon_data_train = kaon_data_train['TrackRich2EntryY']
rich2ExitX_kaon_data_train = kaon_data_train['TrackRich2ExitX']
rich2ExitY_kaon_data_train = kaon_data_train['TrackRich2ExitY']
# add different DLL outputs
Dlle_kaon_data_train = kaon_data_train['RichDLLe']
Dlle2_kaon_data_train = kaon_data_train['RichDLLe2']
Dllmu_kaon_data_train = kaon_data_train['RichDLLmu']
Dllmu2_kaon_data_train = kaon_data_train['RichDLLmu2']
Dllk_kaon_data_train = kaon_data_train['RichDLLk']
Dllk2_kaon_data_train = kaon_data_train['RichDLLk2']
Dllp_kaon_data_train = kaon_data_train['RichDLLp']
Dllp2_kaon_data_train = kaon_data_train['RichDLLp2']
Dlld_kaon_data_train = kaon_data_train['RichDLLd']
Dlld2_kaon_data_train = kaon_data_train['RichDLLd2']
Dllbt_kaon_data_train = kaon_data_train['RichDLLbt']
Dllbt2_kaon_data_train = kaon_data_train['RichDLLbt2']
# convert to numpy array
P_kaon_data_train = P_kaon_data_train.to_numpy()
Pt_kaon_data_train = Pt_kaon_data_train.to_numpy()
nTracks_kaon_data_train = nTracks_kaon_data_train.to_numpy()
numRich1_kaon_data_train = numRich1_kaon_data_train.to_numpy()
numRich2_kaon_data_train = numRich2_kaon_data_train.to_numpy()
rich1EntryX_kaon_data_train = rich1EntryX_kaon_data_train.to_numpy()
rich1EntryY_kaon_data_train = rich1EntryY_kaon_data_train.to_numpy()
rich1ExitX_kaon_data_train = rich1ExitX_kaon_data_train.to_numpy()
rich1ExitY_kaon_data_train = rich1ExitY_kaon_data_train.to_numpy()
rich2EntryX_kaon_data_train = rich2EntryX_kaon_data_train.to_numpy()
rich2EntryY_kaon_data_train = rich2EntryY_kaon_data_train.to_numpy()
rich2ExitX_kaon_data_train = rich2ExitX_kaon_data_train.to_numpy()
rich2ExitY_kaon_data_train = rich2ExitY_kaon_data_train.to_numpy()
Dlle_kaon_data_train = Dlle_kaon_data_train.to_numpy()
Dlle2_kaon_data_train = Dlle2_kaon_data_train.to_numpy()
Dllmu_kaon_data_train = Dllmu_kaon_data_train.to_numpy()
Dllmu2_kaon_data_train = Dllmu2_kaon_data_train.to_numpy()
Dllk_kaon_data_train = Dllk_kaon_data_train.to_numpy()
Dllk2_kaon_data_train = Dllk2_kaon_data_train.to_numpy()
Dllp_kaon_data_train = Dllp_kaon_data_train.to_numpy()
Dllp2_kaon_data_train = Dllp2_kaon_data_train.to_numpy()
Dlld_kaon_data_train = Dlld_kaon_data_train.to_numpy()
Dlld2_kaon_data_train = Dlld2_kaon_data_train.to_numpy()
Dllbt_kaon_data_train = Dllbt_kaon_data_train.to_numpy()
Dllbt2_kaon_data_train = Dllbt2_kaon_data_train.to_numpy()
# Reshape arrays
P_kaon_data_train = np.array(P_kaon_data_train).reshape(-1, 1)
Pt_kaon_data_train = np.array(Pt_kaon_data_train).reshape(-1, 1)
nTracks_kaon_data_train = np.array(nTracks_kaon_data_train).reshape(-1, 1)
numRich1_kaon_data_train = np.array(numRich1_kaon_data_train).reshape(-1, 1)
numRich2_kaon_data_train = np.array(numRich2_kaon_data_train).reshape(-1, 1)
rich1EntryX_kaon_data_train = np.array(rich1EntryX_kaon_data_train).reshape(-1, 1)
rich1EntryY_kaon_data_train = np.array(rich1EntryY_kaon_data_train).reshape(-1, 1)
rich1ExitX_kaon_data_train = np.array(rich1ExitX_kaon_data_train).reshape(-1, 1)
rich1ExitY_kaon_data_train = np.array(rich1ExitY_kaon_data_train).reshape(-1, 1)
rich2EntryX_kaon_data_train = np.array(rich2EntryX_kaon_data_train).reshape(-1, 1)
rich2EntryY_kaon_data_train = np.array(rich2EntryY_kaon_data_train).reshape(-1, 1)
rich2ExitX_kaon_data_train = np.array(rich2ExitX_kaon_data_train).reshape(-1, 1)
rich2ExitY_kaon_data_train = np.array(rich2ExitY_kaon_data_train).reshape(-1, 1)
Dlle_kaon_data_train = np.array(Dlle_kaon_data_train).reshape(-1, 1)
Dlle2_kaon_data_train = np.array(Dlle2_kaon_data_train).reshape(-1, 1)
Dllmu_kaon_data_train = np.array(Dllmu_kaon_data_train).reshape(-1, 1)
Dllmu2_kaon_data_train = np.array(Dllmu2_kaon_data_train).reshape(-1, 1)
Dllk_kaon_data_train = np.array(Dllk_kaon_data_train).reshape(-1, 1)
Dllk2_kaon_data_train = np.array(Dllk2_kaon_data_train).reshape(-1, 1)
Dllp_kaon_data_train = np.array(Dllp_kaon_data_train).reshape(-1, 1)
Dllp2_kaon_data_train = np.array(Dllp2_kaon_data_train).reshape(-1, 1)
Dlld_kaon_data_train = np.array(Dlld_kaon_data_train).reshape(-1, 1)
Dlld2_kaon_data_train = np.array(Dlld2_kaon_data_train).reshape(-1, 1)
Dllbt_kaon_data_train = np.array(Dllbt_kaon_data_train).reshape(-1, 1)
Dllbt2_kaon_data_train = np.array(Dllbt2_kaon_data_train).reshape(-1, 1)
inputs_kaon_data_train = np.concatenate((P_kaon_data_train, Pt_kaon_data_train, nTracks_kaon_data_train, numRich1_kaon_data_train, numRich2_kaon_data_train, rich1EntryX_kaon_data_train,
rich1EntryY_kaon_data_train, rich1ExitX_kaon_data_train, rich1ExitY_kaon_data_train, rich2EntryX_kaon_data_train, rich2EntryY_kaon_data_train, rich2ExitX_kaon_data_train, rich2ExitY_kaon_data_train), axis=1)
Dll_kaon_data_train = np.concatenate((Dlle_kaon_data_train, Dllmu_kaon_data_train, Dllk_kaon_data_train, Dllp_kaon_data_train, Dlld_kaon_data_train, Dllbt_kaon_data_train), axis=1)
Dll2_kaon_data_train = np.concatenate((Dlle2_kaon_data_train, Dllmu2_kaon_data_train, Dllk2_kaon_data_train, Dllp2_kaon_data_train, Dlld2_kaon_data_train, Dllbt2_kaon_data_train), axis=1)
print('Transforming inputs and outputs using Quantile Transformer...')
scaler_inputs = QuantileTransformer(output_distribution='normal', n_quantiles=int(1e5), subsample=int(1e10)).fit(inputs_kaon_data_train)
scaler_Dll = QuantileTransformer(output_distribution='normal', n_quantiles=int(1e5), subsample=int(1e10)).fit(Dll_kaon_data_train)
scaler_Dll2 = QuantileTransformer(output_distribution='normal', n_quantiles=int(1e5), subsample=int(1e10)).fit(Dll2_kaon_data_train)
inputs_kaon_data_train = scaler_inputs.transform(inputs_kaon_data_train)
Dll_kaon_data_train = scaler_Dll.transform(Dll_kaon_data_train)
Dll2_kaon_data_train = scaler_Dll2.transform(Dll2_kaon_data_train)
inputs_kaon_data_train = mapping(inputs_kaon_data_train)
Dll_kaon_data_train = mapping(Dll_kaon_data_train)
Dll2_kaon_data_train = mapping(Dll2_kaon_data_train)
# REPEATING FOR TESTING DATA
print("Producing testing data...")
# add all inputs
P_kaon_data_test = kaon_data_test['TrackP']
Pt_kaon_data_test = kaon_data_test['TrackPt']
nTracks_kaon_data_test = kaon_data_test['NumLongTracks']
numRich1_kaon_data_test = kaon_data_test['NumRich1Hits']
numRich2_kaon_data_test = kaon_data_test['NumRich2Hits']
rich1EntryX_kaon_data_test = kaon_data_test['TrackRich1EntryX']
rich1EntryY_kaon_data_test = kaon_data_test['TrackRich1EntryY']
rich1ExitX_kaon_data_test = kaon_data_test['TrackRich1ExitX']
rich1ExitY_kaon_data_test = kaon_data_test['TrackRich1ExitY']
rich2EntryX_kaon_data_test = kaon_data_test['TrackRich2EntryX']
rich2EntryY_kaon_data_test = kaon_data_test['TrackRich2EntryY']
rich2ExitX_kaon_data_test = kaon_data_test['TrackRich2ExitX']
rich2ExitY_kaon_data_test = kaon_data_test['TrackRich2ExitY']
# add different DLL outputs
Dlle_kaon_data_test = kaon_data_test['RichDLLe']
Dlle2_kaon_data_test = kaon_data_test['RichDLLe2']
Dllmu_kaon_data_test = kaon_data_test['RichDLLmu']
Dllmu2_kaon_data_test = kaon_data_test['RichDLLmu2']
Dllk_kaon_data_test = kaon_data_test['RichDLLk']
Dllk2_kaon_data_test = kaon_data_test['RichDLLk2']
Dllp_kaon_data_test = kaon_data_test['RichDLLp']
Dllp2_kaon_data_test = kaon_data_test['RichDLLp2']
Dlld_kaon_data_test = kaon_data_test['RichDLLd']
Dlld2_kaon_data_test = kaon_data_test['RichDLLd2']
Dllbt_kaon_data_test = kaon_data_test['RichDLLbt']
Dllbt2_kaon_data_test = kaon_data_test['RichDLLbt2']
# convert to numpy array
P_kaon_data_test = P_kaon_data_test.to_numpy()
Pt_kaon_data_test = Pt_kaon_data_test.to_numpy()
nTracks_kaon_data_test = nTracks_kaon_data_test.to_numpy()
numRich1_kaon_data_test = numRich1_kaon_data_test.to_numpy()
numRich2_kaon_data_test = numRich2_kaon_data_test.to_numpy()
rich1EntryX_kaon_data_test = rich1EntryX_kaon_data_test.to_numpy()
rich1EntryY_kaon_data_test = rich1EntryY_kaon_data_test.to_numpy()
rich1ExitX_kaon_data_test = rich1ExitX_kaon_data_test.to_numpy()
rich1ExitY_kaon_data_test = rich1ExitY_kaon_data_test.to_numpy()
rich2EntryX_kaon_data_test = rich2EntryX_kaon_data_test.to_numpy()
rich2EntryY_kaon_data_test = rich2EntryY_kaon_data_test.to_numpy()
rich2ExitX_kaon_data_test = rich2ExitX_kaon_data_test.to_numpy()
rich2ExitY_kaon_data_test = rich2ExitY_kaon_data_test.to_numpy()
Dlle_kaon_data_test = Dlle_kaon_data_test.to_numpy()
Dlle2_kaon_data_test = Dlle2_kaon_data_test.to_numpy()
Dllmu_kaon_data_test = Dllmu_kaon_data_test.to_numpy()
Dllmu2_kaon_data_test = Dllmu2_kaon_data_test.to_numpy()
Dllk_kaon_data_test = Dllk_kaon_data_test.to_numpy()
Dllk2_kaon_data_test = Dllk2_kaon_data_test.to_numpy()
Dllp_kaon_data_test = Dllp_kaon_data_test.to_numpy()
Dllp2_kaon_data_test = Dllp2_kaon_data_test.to_numpy()
Dlld_kaon_data_test = Dlld_kaon_data_test.to_numpy()
Dlld2_kaon_data_test = Dlld2_kaon_data_test.to_numpy()
Dllbt_kaon_data_test = Dllbt_kaon_data_test.to_numpy()
Dllbt2_kaon_data_test = Dllbt2_kaon_data_test.to_numpy()
P_kaon_data_test = np.array(P_kaon_data_test).reshape(-1, 1)
Pt_kaon_data_test = np.array(Pt_kaon_data_test).reshape(-1, 1)
nTracks_kaon_data_test = np.array(nTracks_kaon_data_test).reshape(-1, 1)
numRich1_kaon_data_test = np.array(numRich1_kaon_data_test).reshape(-1, 1)
numRich2_kaon_data_test = np.array(numRich2_kaon_data_test).reshape(-1, 1)
rich1EntryX_kaon_data_test = np.array(rich1EntryX_kaon_data_test).reshape(-1, 1)
rich1EntryY_kaon_data_test = np.array(rich1EntryY_kaon_data_test).reshape(-1, 1)
rich1ExitX_kaon_data_test = np.array(rich1ExitX_kaon_data_test).reshape(-1, 1)
rich1ExitY_kaon_data_test = np.array(rich1ExitY_kaon_data_test).reshape(-1, 1)
rich2EntryX_kaon_data_test = np.array(rich2EntryX_kaon_data_test).reshape(-1, 1)
rich2EntryY_kaon_data_test = np.array(rich2EntryY_kaon_data_test).reshape(-1, 1)
rich2ExitX_kaon_data_test = np.array(rich2ExitX_kaon_data_test).reshape(-1, 1)
rich2ExitY_kaon_data_test = np.array(rich2ExitY_kaon_data_test).reshape(-1, 1)
Dlle_kaon_data_test = np.array(Dlle_kaon_data_test).reshape(-1, 1)
Dlle2_kaon_data_test = np.array(Dlle2_kaon_data_test).reshape(-1, 1)
Dllmu_kaon_data_test = np.array(Dllmu_kaon_data_test).reshape(-1, 1)
Dllmu2_kaon_data_test = np.array(Dllmu2_kaon_data_test).reshape(-1, 1)
Dllk_kaon_data_test = np.array(Dllk_kaon_data_test).reshape(-1, 1)
Dllk2_kaon_data_test = np.array(Dllk2_kaon_data_test).reshape(-1, 1)
Dllp_kaon_data_test = np.array(Dllp_kaon_data_test).reshape(-1, 1)
Dllp2_kaon_data_test = np.array(Dllp2_kaon_data_test).reshape(-1, 1)
Dlld_kaon_data_test = np.array(Dlld_kaon_data_test).reshape(-1, 1)
Dlld2_kaon_data_test = np.array(Dlld2_kaon_data_test).reshape(-1, 1)
Dllbt_kaon_data_test = np.array(Dllbt_kaon_data_test).reshape(-1, 1)
Dllbt2_kaon_data_test = np.array(Dllbt2_kaon_data_test).reshape(-1, 1)
inputs_kaon_data_test = np.concatenate((P_kaon_data_test, Pt_kaon_data_test, nTracks_kaon_data_test, numRich1_kaon_data_test, numRich2_kaon_data_test, rich1EntryX_kaon_data_test, rich1EntryY_kaon_data_test, rich1ExitX_kaon_data_test, rich1ExitY_kaon_data_test, rich2EntryX_kaon_data_test, rich2EntryY_kaon_data_test, rich2ExitX_kaon_data_test, rich2ExitY_kaon_data_test), axis=1)
Dll_kaon_data_test = np.concatenate((Dlle_kaon_data_test, Dllmu_kaon_data_test, Dllk_kaon_data_test, Dllp_kaon_data_test, Dlld_kaon_data_test, Dllbt_kaon_data_test), axis=1)
Dll2_kaon_data_test = np.concatenate((Dlle2_kaon_data_test, Dllmu2_kaon_data_test, Dllk2_kaon_data_test, Dllp2_kaon_data_test, Dlld2_kaon_data_test, Dllbt2_kaon_data_test), axis=1)
print('Transforming inputs and outputs using Quantile Transformer...')
inputs_kaon_data_test = scaler_inputs.transform(inputs_kaon_data_test)
Dll_kaon_data_test = scaler_Dll.transform(Dll_kaon_data_test)
Dll2_kaon_data_test = scaler_Dll.transform(Dll2_kaon_data_test)
inputs_kaon_data_test = mapping(inputs_kaon_data_test)
Dll_kaon_data_test = mapping(Dll_kaon_data_test)
Dll2_kaon_data_test = mapping(Dll2_kaon_data_test)
# Producing testing data
params_list_test = np.random.normal(loc=mu, scale=sigma, size=[len(kaon_data_test), self.params])
for e in range(len(kaon_data_test)):
params_list_test[e][0] = inputs_kaon_data_test[e][0]
params_list_test[e][1] = inputs_kaon_data_test[e][1]
params_list_test[e][2] = inputs_kaon_data_test[e][2]
params_list_test[e][3] = inputs_kaon_data_test[e][3]
params_list_test[e][4] = inputs_kaon_data_test[e][4]
params_list_test[e][5] = inputs_kaon_data_test[e][5]
params_list_test[e][6] = inputs_kaon_data_test[e][6]
params_list_test[e][7] = inputs_kaon_data_test[e][7]
params_list_test[e][8] = inputs_kaon_data_test[e][8]
params_list_test[e][9] = inputs_kaon_data_test[e][9]
params_list_test[e][10] = inputs_kaon_data_test[e][10]
params_list_test[e][11] = inputs_kaon_data_test[e][11]
params_list_test[e][12] = inputs_kaon_data_test[e][12]
obs_simu_1_test = np.zeros((len(kaon_data_test), self.observables, 1))
obs_simu_1_test.fill(-1)
for e in range(len(kaon_data_test)):
obs_simu_1_test[e][0][0] = Dll_kaon_data_test[e][0]
obs_simu_1_test[e][1][0] = Dll_kaon_data_test[e][1]
obs_simu_1_test[e][2][0] = Dll_kaon_data_test[e][2]
obs_simu_1_test[e][3][0] = Dll_kaon_data_test[e][3]
obs_simu_1_test[e][4][0] = Dll_kaon_data_test[e][4]
obs_simu_1_test[e][5][0] = Dll_kaon_data_test[e][5]
obs_simu_2_test = np.zeros((len(kaon_data_test), self.observables, 1))
obs_simu_2_test.fill(-1)
for e in range(len(kaon_data_test)):
obs_simu_2_test[e][0][0] = Dll2_kaon_data_test[e][0]
obs_simu_2_test[e][1][0] = Dll2_kaon_data_test[e][1]
obs_simu_2_test[e][2][0] = Dll2_kaon_data_test[e][2]
obs_simu_2_test[e][3][0] = Dll2_kaon_data_test[e][3]
obs_simu_2_test[e][4][0] = Dll2_kaon_data_test[e][4]
obs_simu_2_test[e][5][0] = Dll2_kaon_data_test[e][5]
event_no_par = 0
event_no_obs_1 = 0
event_no_obs_2 = 0
d1_hist, d2_hist, d_hist, g_hist, a1_hist, a2_hist = list(), list(), list(), list(), list(), list()
print('Beginning pre-training...')
'''
#Pre-training stage
'''
for train_step in range(pretrain_steps):
log_mesg = '%d' % train_step
noise_value = 0.3
params_list = np.random.normal(loc=mu,scale=sigma, size=[batch_size, self.params])
y_ones = np.ones([batch_size, 1])
y_zeros = np.zeros([batch_size, 1])
# add physics parameters + noise to params_list
for b in range(batch_size):
params_list[b][0] = inputs_kaon_data_train[event_no_par][0]
params_list[b][1] = inputs_kaon_data_train[event_no_par][1]
params_list[b][2] = inputs_kaon_data_train[event_no_par][2]
params_list[b][3] = inputs_kaon_data_train[event_no_par][3]
params_list[b][4] = inputs_kaon_data_train[event_no_par][4]
params_list[b][5] = inputs_kaon_data_train[event_no_par][5]
params_list[b][6] = inputs_kaon_data_train[event_no_par][6]
params_list[b][7] = inputs_kaon_data_train[event_no_par][7]
params_list[b][8] = inputs_kaon_data_train[event_no_par][8]
params_list[b][9] = inputs_kaon_data_train[event_no_par][9]
params_list[b][10] = inputs_kaon_data_train[event_no_par][10]
params_list[b][11] = inputs_kaon_data_train[event_no_par][11]
params_list[b][12] = inputs_kaon_data_train[event_no_par][12]
event_no_par += 1
# Step 1
# simulated observables (number 1)
obs_simu_1 = np.zeros((batch_size, self.observables, 1))
obs_simu_1.fill(-1)
for b in range(batch_size):
obs_simu_1[b][0][0] = Dll_kaon_data_train[event_no_obs_1][0]
obs_simu_1[b][1][0] = Dll_kaon_data_train[event_no_obs_1][1]
obs_simu_1[b][2][0] = Dll_kaon_data_train[event_no_obs_1][2]
obs_simu_1[b][3][0] = Dll_kaon_data_train[event_no_obs_1][3]
obs_simu_1[b][4][0] = Dll_kaon_data_train[event_no_obs_1][4]
obs_simu_1[b][5][0] = Dll_kaon_data_train[event_no_obs_1][5]
event_no_obs_1 += 1
obs_simu_1_copy = np.copy(obs_simu_1)
# simulated observables (Gaussian smeared - number 2)
obs_simu_2 = np.zeros((batch_size, self.observables, 1))
obs_simu_2.fill(-1)
for b in range(batch_size):
obs_simu_2[b][0][0] = Dll2_kaon_data_train[event_no_obs_2][0]
obs_simu_2[b][1][0] = Dll2_kaon_data_train[event_no_obs_2][1]
obs_simu_2[b][2][0] = Dll2_kaon_data_train[event_no_obs_2][2]
obs_simu_2[b][3][0] = Dll2_kaon_data_train[event_no_obs_2][3]
obs_simu_2[b][4][0] = Dll2_kaon_data_train[event_no_obs_2][4]
obs_simu_2[b][5][0] = Dll2_kaon_data_train[event_no_obs_2][5]
event_no_obs_2 += 1
obs_simu_2_copy = np.copy(obs_simu_2)
# emulated DLL values
obs_emul = self.emulator.predict(params_list)
obs_emul_copy = np.copy(obs_emul)
# decay the learn rate
if(train_step % 1000 == 0 and train_step>0):
siamese_lr = K.eval(self.siamese.optimizer.lr)
K.set_value(self.siamese.optimizer.lr, siamese_lr*0.7)
print('lr for Siamese network updated from %f to %f' % (siamese_lr, siamese_lr*0.7))
adversarial1_lr = K.eval(self.adversarial1.optimizer.lr)
K.set_value(self.adversarial1.optimizer.lr, adversarial1_lr*0.7)
print('lr for Adversarial1 network updated from %f to %f' % (adversarial1_lr, adversarial1_lr*0.7))
loss_simu_list = [obs_simu_1_copy, obs_simu_2_copy]
loss_fake_list = [obs_simu_1_copy, obs_emul_copy]
input_val = 0
# swap which inputs to give to Siamese network
if(np.random.random() < 0.5):
loss_simu_list[0], loss_simu_list[1] = loss_simu_list[1], loss_simu_list[0]
if(np.random.random() < 0.5):
loss_fake_list[0] = obs_simu_2_copy
input_val = 1
# noise
y_ones = np.array([np.random.uniform(0.97, 1.00) for x in range(batch_size)]).reshape([batch_size, 1])
y_zeros = np.array([np.random.uniform(0.00, 0.03) for x in range(batch_size)]).reshape([batch_size, 1])
if(input_val == 0):
if np.random.random() < noise_value:
for b in range(batch_size):
if np.random.random() < noise_value:
obs_simu_1_copy[b], obs_simu_2_copy[b] = obs_simu_2[b], obs_simu_1[b]
obs_simu_1_copy[b], obs_emul_copy[b] = obs_emul[b], obs_simu_1[b]
if(input_val == 1):
if np.random.random() < noise_value:
for b in range(batch_size):
if np.random.random() < noise_value:
obs_simu_1_copy[b], obs_simu_2_copy[b] = obs_simu_2[b], obs_simu_1[b]
obs_simu_2_copy[b], obs_emul_copy[b] = obs_emul[b], obs_simu_2[b]
# train siamese
d_loss_simu = self.siamese.train_on_batch(loss_simu_list, y_ones)
d_loss_fake = self.siamese.train_on_batch(loss_fake_list, y_zeros)
d_loss = 0.5 * np.add(d_loss_simu, d_loss_fake)
log_mesg = '%s [S loss: %f]' % (log_mesg, d_loss[0])
#print(log_mesg)
#print('--------------------')
#noise_value*=0.999
#Step 2
# train emulator
a_loss_list = [obs_simu_1, params_list]
a_loss = self.adversarial1.train_on_batch(a_loss_list, y_ones)
log_mesg = '%s [E loss: %f]' % (log_mesg, a_loss[0])
print(log_mesg)
print('--------------------')
noise_value*=0.999
if __name__ == '__main__':
params_physics = 13
params_noise = 51 #51 looks ok, 61 is probably best, 100 also works
params = params_physics + params_noise
observables= 6
train_no = 1
magan = ModelAssistedGANPID(params=params, observables=observables)
magan.train(pretrain_steps=11001, train_steps=10000, batch_size=32, train_no=train_no)
NETWORKS
class Networks(object):
def __init__(self, noise_size=100, params=64, observables=5):
self.noise_size = noise_size
self.params = params
self.observables = observables
self.E = None # emulator
self.S = None # siamese
self.SM = None # siamese model
self.AM1 = None # adversarial model 1
'''
Emulator: generate identical observable parameters to those of the simulator S when both E and S are fed with the same input parameters
'''
def emulator(self):
if self.E:
return self.E
# input params
# the model takes as input an array of shape (*, self.params = 6)
input_params_shape = (self.params,)
input_params_layer = Input(shape=input_params_shape, name='input_params')
# architecture
self.E = Dense(1024)(input_params_layer)
self.E = LeakyReLU(0.2)(self.E)
self.E = Dense(self.observables*128, kernel_initializer=initializers.RandomNormal(stddev=0.02))(self.E)
self.E = LeakyReLU(0.2)(self.E)
self.E = Reshape((self.observables, 128))(self.E)
self.E = UpSampling1D(size=2)(self.E)
self.E = Conv1D(64, kernel_size=7, padding='valid')(self.E)
self.E = LeakyReLU(0.2)(self.E)
self.E = UpSampling1D(size=2)(self.E)
self.E = Conv1D(1, kernel_size=7, padding='valid', activation='tanh')(self.E)
# model
self.E = Model(inputs=input_params_layer, outputs=self.E, name='emulator')
# print
print("Emulator")
self.E.summary()
return self.E
'''
Siamese: determine the similarity between output values produced by the simulator and emulator
'''
def siamese(self):
if self.S:
return self.S
# input DLL images
input_shape = (self.observables, 1)
input_layer_anchor = Input(shape=input_shape, name='input_layer_anchor')
input_layer_candid = Input(shape=input_shape, name='input_layer_candidate')
input_layer = Input(shape=input_shape, name='input_layer')
# siamese
cnn = Conv1D(64, kernel_size=8, strides=2, padding='same',
kernel_initializer=initializers.RandomNormal(stddev=0.02))(input_layer)
cnn = LeakyReLU(0.2)(cnn)
cnn = Conv1D(128, kernel_size=5, strides=2, padding='same')(cnn)
cnn = LeakyReLU(0.2)(cnn)
cnn = Flatten()(cnn)
cnn = Dense(128, activation='sigmoid')(cnn)
cnn = Model(inputs=input_layer, outputs=cnn, name='cnn')
# left and right encodings
encoded_l = cnn(input_layer_anchor)
encoded_r = cnn(input_layer_candid)
# merge two encoded inputs with the L1 or L2 distance between them
L1_distance = lambda x: K.abs(x[0]-x[1])
L2_distance = lambda x: (x[0]-x[1]+K.epsilon())**2/(x[0]+x[1]+K.epsilon())
both = Lambda(L2_distance)([encoded_l, encoded_r])
prediction = Dense(1, activation='sigmoid')(both)
# model
self.S = Model([input_layer_anchor, input_layer_candid], outputs=prediction, name='siamese')
# print
print("Siamese:")
self.S.summary()
print("Siamese CNN:")
cnn.summary()
return self.S
'''
Siamese model
'''
def siamese_model(self):
if self.SM:
return self.SM
# optimizer
optimizer = Adam(lr=0.004, beta_1=0.5, beta_2=0.9)
# input DLL values
input_shape = (self.observables, 1)
input_layer_anchor = Input(shape=input_shape, name='input_layer_anchor')
input_layer_candid = Input(shape=input_shape, name='input_layer_candidate')
input_layer = [input_layer_anchor, input_layer_candid]
# discriminator
siamese_ref = self.siamese()
siamese_ref.trainable = True
self.SM = siamese_ref(input_layer)
# model
self.SM = Model(inputs=input_layer, outputs=self.SM, name='siamese_model')
self.SM.compile(loss='binary_crossentropy', optimizer=optimizer, metrics=[metrics.binary_accuracy])
print("Siamese model")
self.SM.summary()
return self.SM
'''
Adversarial 1 model (adversarial pre-training phase) - this is where the emulator and siamese network are trained to enable the emulator to generate DLL values for a set of given physics inputs
'''
def adversarial1_model(self):
if self.AM1:
return self.AM1
optimizer = Adam(lr=0.0004, beta_1=0.5, beta_2=0.9)
# input 1: simulated DLL values
input_obs_shape = (self.observables, 1)
input_obs_layer = Input(shape=input_obs_shape, name='input_obs')
# input 2: params
input_params_shape = (self.params, )
input_params_layer = Input(shape=input_params_shape, name='input_params')
# emulator
emulator_ref = self.emulator()
emulator_ref.trainable = True
self.AM1 = emulator_ref(input_params_layer)
# siamese
siamese_ref = self.siamese()
siamese_ref.trainable = False
self.AM1 = siamese_ref([input_obs_layer, self.AM1])
# model
input_layer = [input_obs_layer, input_params_layer]
self.AM1 = Model(inputs=input_layer, outputs=self.AM1, name='adversarial_1_model')
self.AM1.compile(loss='binary_crossentropy', optimizer=optimizer, metrics=[metrics.binary_accuracy])
# print
print("Adversarial 1 model:")
self.AM1.summary()
return self.AM1
INPUTS PLOT
OUTPUTS PLOT
LOSS PLOT
GENERATED OUTPUT (ORANGE) vs TRUE OUTPUT (BLUE)

Tensorflow NMT example outputs only the same word for inference

Trying to recreate the Tensorflow NMT example
https://github.com/tensorflow/nmt#bidirectional-rnns
with a baseline of just copying the original sentence instead of translating, but getting this weird bug for my inference part where the only outputs are the same words multiple times.
Using the TF attention wrapper and using Greedy Embedding Helper for inference.
Using TF 1.3 and python 3.6 if that helps
Screenshot of the bugged prediction
The weird thing is during training, the predictions are normal and the loss decreased to around 0.1
I have already checked the embeddings and they do change from each time step and I suspect that this has something to do with the decoding stage since it's the only part the really changes from training to inference.
tf.reset_default_graph()
sess = tf.InteractiveSession()
PAD = 0
EOS = 1
max_gradient_norm = 1
learning_rate = 0.02
num_layers = 1
total_epoch = 2
sentence_length = 19
vocab_size = 26236
input_embedding_size = 128
if mode == "training":
batch_size = 100
isReused = None
else:
batch_size = 1
isReused = True
with tf.name_scope("encoder"):
encoder_embeddings = tf.get_variable('encoder_embeddings', [vocab_size, input_embedding_size], tf.float32,
tf.random_uniform_initializer(-1.0, 1.0))
encoder_hidden_units = 128
encoder_inputs = tf.placeholder(shape=(batch_size, None), dtype=tf.int32, name='encoder_inputs')
encoder_lengths = tf.placeholder(shape=batch_size, dtype=tf.int32, name='encoder_lengths')
encoder_cell = tf.contrib.rnn.BasicLSTMCell(encoder_hidden_units, state_is_tuple=True)
encoder_inputs_embedded = tf.nn.embedding_lookup(encoder_embeddings, encoder_inputs)
encoder_outputs, encoder_state = tf.nn.dynamic_rnn(encoder_cell, encoder_inputs_embedded, dtype=tf.float32,
sequence_length=encoder_lengths, time_major=False)
with tf.variable_scope("decoder", isReused):
decoder_hidden_units = encoder_hidden_units
decoder_inputs = tf.placeholder(shape=(batch_size, None), dtype=tf.int32, name='decoder_inputs')
decoder_targets = tf.placeholder(shape=(batch_size, None), dtype=tf.int32, name='decoder_targets')
decoder_lengths = tf.placeholder(shape=batch_size, dtype=tf.int32, name="decoder_lengths")
decoder_embeddings = tf.get_variable('decoder_embeddings', [vocab_size, input_embedding_size], tf.float32,
tf.random_uniform_initializer(-1.0, 1.0))
decoder_inputs_embedded = tf.nn.embedding_lookup(decoder_embeddings, decoder_inputs)
decoder_cell = tf.contrib.rnn.BasicLSTMCell(decoder_hidden_units, state_is_tuple=True)
projection_layer = layers_core.Dense(vocab_size, use_bias=False)
attention_mechanism = tf.contrib.seq2seq.LuongAttention(encoder_hidden_units, encoder_outputs,
memory_sequence_length=encoder_lengths)
attn_decoder_cell = tf.contrib.seq2seq.AttentionWrapper(decoder_cell, attention_mechanism,
attention_layer_size=encoder_hidden_units)
if mode == "training":
helper = tf.contrib.seq2seq.TrainingHelper(decoder_inputs_embedded, decoder_lengths, time_major=False)
maximum_iterations = None
else:
helper = tf.contrib.seq2seq.GreedyEmbeddingHelper(decoder_embeddings, tf.fill([batch_size], EOS), EOS)
maximum_iterations = tf.round(tf.reduce_max(encoder_lengths) * 2)
# Decoder
init_state = attn_decoder_cell.zero_state(batch_size, tf.float32).clone(cell_state=encoder_state)
decoder = tf.contrib.seq2seq.BasicDecoder(attn_decoder_cell, helper, init_state, output_layer=projection_layer)
# Dynamic decoding
decoder_outputs, decoder_final_state, _ = tf.contrib.seq2seq.dynamic_decode(decoder, output_time_major=False,
swap_memory=True,
maximum_iterations=maximum_iterations)
decoder_logits = decoder_outputs.rnn_output
decoder_prediction = decoder_outputs.sample_id
if mode == "training":
with tf.name_scope("cross_entropy"):
labels = tf.one_hot(decoder_targets, depth=vocab_size, dtype=tf.float32)
decoder_crossent = tf.nn.softmax_cross_entropy_with_logits(labels=labels, logits=decoder_logits)
with tf.name_scope("loss"):
target_weights = tf.sequence_mask(decoder_lengths, maxlen=20, dtype=decoder_logits.dtype)
train_loss = tf.reduce_sum(decoder_crossent * target_weights) / (batch_size * 20)
tf.summary.scalar('loss', train_loss)
with tf.name_scope("clip_gradients"):
params = tf.trainable_variables()
gradients = tf.gradients(train_loss, params)
clipped_gradients, _ = tf.clip_by_global_norm(gradients, max_gradient_norm)
with tf.name_scope("Optimizer"):
optimizer = tf.train.AdamOptimizer(learning_rate)
update_step = optimizer.apply_gradients(zip(clipped_gradients, params))
merged = tf.summary.merge_all()
train_writer = tf.summary.FileWriter(os.getcwd() + '/train', sess.graph)
test_writer = tf.summary.FileWriter(os.getcwd() + '/test', )
tf.global_variables_initializer().run()
sess.run(tf.global_variables_initializer())

very large value of loss in AlexNet

Actually I am using AlexNet to classify my images in 2 groups , I am feeding images to the model in a batch of 60 images and the loss which I am getting after every batch is 6 to 7 digits large (for ex. 1428529.0) , here I am confused that why my loss is such a large value because on MNIST dataset the loss which I got was very small as compared to this. Can anyone explain me why I am getting such a large loss value.
Thanks in advance ;-)
Here is the code :-
import tensorflow as tf
import matplotlib.pyplot as plt
import numpy as np
import os
img_size = 227
num_channels = 1
img_flat_size = img_size * img_size
num_classes = 2
drop = 0.5
x = tf.placeholder(tf.float32,[None,img_flat_size])
y = tf.placeholder(tf.float32,[None,num_classes])
drop_p = tf.placeholder(tf.float32)
def new_weight(shape):
return tf.Variable(tf.random_normal(shape))
def new_bias(size):
return tf.Variable(tf.random_normal(size))
def new_conv(x,num_input_channels,filter_size,num_filters,stride,padd="SAME"):
shape = [filter_size,filter_size,num_input_channels,num_filters]
weight = new_weight(shape)
bias = new_bias([num_filters])
conv = tf.nn.conv2d(x,weight,strides=[1,stride,stride,1],padding=padd)
conv = tf.nn.bias_add(conv,bias)
return tf.nn.relu(conv)
def new_max_pool(x,k,stride):
max_pool = tf.nn.max_pool(x,ksize=[1,k,k,1],strides=[1,stride,stride,1],padding="VALID")
return max_pool
def flatten_layer(layer):
layer_shape = layer.get_shape()
num_features = layer_shape[1:4].num_elements()
flat_layer = tf.reshape(layer,[-1,num_features])
return flat_layer,num_features
def new_fc_layer(x,num_input,num_output):
weight = new_weight([num_input,num_output])
bias = new_bias([num_output])
fc_layer = tf.matmul(x,weight) + bias
return fc_layer
def lrn(x, radius, alpha, beta, bias=1.0):
"""Create a local response normalization layer."""
return tf.nn.local_response_normalization(x, depth_radius=radius,
alpha=alpha, beta=beta,
bias=bias)
def AlexNet(x,drop,img_size):
x = tf.reshape(x,shape=[-1,img_size,img_size,1])
conv1 = new_conv(x,num_channels,11,96,4,"VALID")
max_pool1 = new_max_pool(conv1,3,2)
norm1 = lrn(max_pool1, 2, 2e-05, 0.75)
conv2 = new_conv(norm1,96,5,256,1)
max_pool2 = new_max_pool(conv2,3,2)
norm2 = lrn(max_pool2, 2, 2e-05, 0.75)
conv3 = new_conv(norm2,256,3,384,1)
conv4 = new_conv(conv3,384,3,384,1)
conv5 = new_conv(conv4,384,3,256,1)
max_pool3 = new_max_pool(conv5,3,2)
layer , num_features = flatten_layer(max_pool3)
fc1 = new_fc_layer(layer,num_features,4096)
fc1 = tf.nn.relu(fc1)
fc1 = tf.nn.dropout(fc1,drop)
fc2 = new_fc_layer(fc1,4096,4096)
fc2 = tf.nn.relu(fc2)
fc2 = tf.nn.dropout(fc2,drop)
out = new_fc_layer(fc2,4096,2)
return out #, tf.nn.softmax(out)
def read_and_decode(tfrecords_file, batch_size):
'''read and decode tfrecord file, generate (image, label) batches
Args:
tfrecords_file: the directory of tfrecord file
batch_size: number of images in each batch
Returns:
image: 4D tensor - [batch_size, width, height, channel]
label: 1D tensor - [batch_size]
'''
# make an input queue from the tfrecord file
filename_queue = tf.train.string_input_producer([tfrecords_file])
reader = tf.TFRecordReader()
_, serialized_example = reader.read(filename_queue)
img_features = tf.parse_single_example(
serialized_example,
features={
'label': tf.FixedLenFeature([], tf.int64),
'image_raw': tf.FixedLenFeature([], tf.string),
})
image = tf.decode_raw(img_features['image_raw'], tf.uint8)
##########################################################
# you can put data augmentation here, I didn't use it
##########################################################
# all the images of notMNIST are 28*28, you need to change the image size if you use other dataset.
image = tf.reshape(image, [227, 227])
label = tf.cast(img_features['label'], tf.int32)
image_batch, label_batch = tf.train.batch([image, label],
batch_size= batch_size,
num_threads= 1,
capacity = 6000)
return tf.reshape(image_batch,[batch_size,227*227*1]), tf.reshape(label_batch, [batch_size])
pred = AlexNet(x,drop_p,img_size) #pred
loss = tf.reduce_mean(tf.nn.softmax_cross_entropy_with_logits(logits=pred,labels=y))
optimiser = tf.train.AdamOptimizer(learning_rate = 0.001).minimize(loss)
correct_pred = tf.equal(tf.argmax(pred,1),tf.argmax(y,1))
accuracy = tf.reduce_mean(tf.cast(correct_pred,tf.float32))
cost = tf.summary.scalar('loss',loss)
init = tf.global_variables_initializer()
with tf.Session() as sess:
sess.run(init)
merge_summary = tf.summary.merge_all()
summary_writer = tf.summary.FileWriter('./AlexNet',graph = tf.get_default_graph())
tf_record_file = 'train.tfrecords'
x_val ,y_val = read_and_decode(tf_record_file,20)
y_val = tf.one_hot(y_val,depth=2,on_value=1,off_value=0)
coord = tf.train.Coordinator()
threads = tf.train.start_queue_runners(coord=coord)
x_val = x_val.eval()
y_val = y_val.eval()
epoch = 2
for i in range(epoch):
_, summary= sess.run([optimiser,merge_summary],feed_dict={x:x_val,y:y_val,drop_p:drop})
summary_writer.add_summary(summary,i)
loss_a,accu = sess.run([loss,accuracy],feed_dict={x:x_val,y:y_val,drop_p:1.0})
print "Epoch "+str(i+1) +', Minibatch Loss = '+ \
"{:.6f}".format(loss_a) + ', Training Accuracy = '+ \
'{:.5f}'.format(accu)
print "Optimization Finished!"
tf_record_file1 = 'test.tfrecords'
x_v ,y_v = read_and_decode(tf_record_file1,10)
y_v = tf.one_hot(y_v,depth=2,on_value=1,off_value=0)
coord1 = tf.train.Coordinator()
threads1 = tf.train.start_queue_runners(coord=coord1)
x_v = sess.run(x_v)
y_v = sess.run(y_v)
print "Testing Accuracy : "
print sess.run(accuracy,feed_dict={x:x_v,y:y_v,drop_p:1.0})
coord.request_stop()
coord.join(threads)
coord1.request_stop()
coord1.join(threads1)
Take a look a what a confusion matrix is. It is a performance evaluator. In addition, you should compare your precision versus your recall. Precision is the accuracy of your positive predictions and recall is the ratio of positive instances that are correctly detected by the classifier. By combining both precision and recall, you get the F_1 score which is keep in evaluating the problems of your model.
I would suggest you pick up the text Hands-On Machine Learning with Scikit-Learn and TensorFlow. It is a truly comprehensive book and covers what I describe above in more detail.

DNN With embedded layer returning sin wave cost/accuracy

I am a total newbie to tensor flow and machine learning, but trying to model a DNN with an embedded layer infront of it. For some reason I keep getting a sin wave of cost results as well as accuracy. I imagine there is something wrong with my code, so here goes:
This is my model and training routines:
def neural_network_model(x):
W = tf.Variable(
tf.truncated_normal([vocab_size, embedding_size], stddev=1 / math.sqrt(vocab_size)),
name="W")
embedded = tf.nn.embedding_lookup(W, x)
embedding_aggregated = tf.reduce_sum(embedded, [1])
hidden_1_layer = {
'weights': tf.Variable(tf.random_normal([embedding_size, n_nodes_hl1])),
'biases': tf.Variable(tf.random_normal([n_nodes_hl1]))
}
hidden_2_layer = {
'weights': tf.Variable(tf.random_normal([n_nodes_hl1, n_nodes_hl2])),
'biases': tf.Variable(tf.random_normal([n_nodes_hl2]))
}
hidden_3_layer = {
'weights': tf.Variable(tf.random_normal([n_nodes_hl2, n_nodes_hl3])),
'biases': tf.Variable(tf.random_normal([n_nodes_hl3]))
}
output = {
'weights': tf.Variable(tf.random_normal([n_nodes_hl3, n_classes])),
'biases': tf.Variable(tf.random_normal([n_classes]))
}
l1 = tf.matmul(embedding_aggregated, hidden_1_layer['weights']) + hidden_1_layer['biases']
l1 = tf.nn.relu(l1)
l2 = tf.matmul(l1, hidden_2_layer['weights']) + hidden_2_layer['biases']
l2 = tf.nn.relu(l2)
l3 = tf.matmul(l2, hidden_3_layer['weights']) + hidden_3_layer['biases']
l3 = tf.nn.relu(l3)
output = tf.matmul(l3, output['weights']) + output['biases']
return output
def train_neural_network(x_batch, y_batch, test_x, test_y):
global_step = tf.Variable(0, trainable=False, name='global_step')
logits = neural_network_model(x_batch)
cost = tf.reduce_mean(tf.nn.softmax_cross_entropy_with_logits(logits, y_batch))
tf.scalar_summary('cost', cost)
optimizer = tf.train.AdagradOptimizer(0.01).minimize(cost, global_step = global_step)
test_logits = neural_network_model(test_x)
prediction = tf.nn.softmax(test_logits)
correct = tf.equal(tf.argmax(prediction, 1), tf.argmax(test_y, 1))
accuracy = tf.reduce_mean(tf.cast(correct, tf.float32))
tf.scalar_summary('accuracy', accuracy)
merged = tf.merge_all_summaries()
saver = tf.train.Saver()
model_dir = "model_embedding"
latest_checkpoint = tf.train.latest_checkpoint(model_dir)
with tf.Session() as sess:
train_writer = tf.train.SummaryWriter(model_dir + "/eval", sess.graph)
if (latest_checkpoint != None):
print("Restoring: ", latest_checkpoint)
saver.restore(sess, latest_checkpoint)
else:
print("Nothing to restore")
sess.run(tf.initialize_all_variables())
coord = tf.train.Coordinator()
threads = tf.train.start_queue_runners(sess=sess, coord=coord)
try:
epoch = 1
while not coord.should_stop():
epoch_loss = 0
_, c, summary = sess.run([optimizer, cost, merged])
# embd = sess.run(emb)
# for idx in range(xb.size):
# print(xb[idx])
# print(yb[idx])
train_writer.add_summary(summary, global_step = global_step.eval())
epoch_loss += c
print('Epoch', epoch, 'completed out of',hm_epochs,'loss:',epoch_loss)
print("Global step: ", global_step.eval())
print('Accuracy:',accuracy.eval())
#saver.save(sess, model_dir+'/model.ckpt', global_step=global_step) # default to last 5 checkpoint saves
epoch += 1
except tf.errors.OutOfRangeError:
print('Done training -- epoch limit reached')
finally:
coord.request_stop()
coord.join(threads)
sess.close()
My data is a bunch of word integer IDs padded to a size of 2056 uniformly with the padding token being added at the end so a lot of my tensors have a bunch of vocab_size integer value at the end, in order to pad up to 2056.
Is there something glaringly obvious about my code thats wrong?
For whoever runs into the same issue:
My error was reusing the neural_network_model() function and thus creating a new set of variables. The answer lies in reading how to share variables, and TF has a good page describing that at Sharing Variables

How to get a prediction using Torch7

I'm still familiarizing myself with Torch and so far so good. I have however hit a dead end that I'm not sure how to get around: how can I get Torch7 (or more specifically the dp library) to evaluate a single input and return the predicted output?
Here's my setup (basically the dp demo):
require 'dp'
--[[hyperparameters]]--
opt = {
nHidden = 100, --number of hidden units
learningRate = 0.1, --training learning rate
momentum = 0.9, --momentum factor to use for training
maxOutNorm = 1, --maximum norm allowed for output neuron weights
batchSize = 128, --number of examples per mini-batch
maxTries = 100, --maximum number of epochs without reduction in validation error.
maxEpoch = 1000 --maximum number of epochs of training
}
--[[data]]--
datasource = dp.Mnist{input_preprocess = dp.Standardize()}
print("feature size: ", datasource:featureSize())
--[[Model]]--
model = dp.Sequential{
models = {
dp.Neural{
input_size = datasource:featureSize(),
output_size = opt.nHidden,
transfer = nn.Tanh(),
sparse_init = true
},
dp.Neural{
input_size = opt.nHidden,
output_size = #(datasource:classes()),
transfer = nn.LogSoftMax(),
sparse_init = true
}
}
}
--[[Propagators]]--
train = dp.Optimizer{
loss = dp.NLL(),
visitor = { -- the ordering here is important:
dp.Momentum{momentum_factor = opt.momentum},
dp.Learn{learning_rate = opt.learningRate},
dp.MaxNorm{max_out_norm = opt.maxOutNorm}
},
feedback = dp.Confusion(),
sampler = dp.ShuffleSampler{batch_size = opt.batchSize},
progress = true
}
valid = dp.Evaluator{
loss = dp.NLL(),
feedback = dp.Confusion(),
sampler = dp.Sampler{}
}
test = dp.Evaluator{
loss = dp.NLL(),
feedback = dp.Confusion(),
sampler = dp.Sampler{}
}
--[[Experiment]]--
xp = dp.Experiment{
model = model,
optimizer = train,
validator = valid,
tester = test,
observer = {
dp.FileLogger(),
dp.EarlyStopper{
error_report = {'validator','feedback','confusion','accuracy'},
maximize = true,
max_epochs = opt.maxTries
}
},
random_seed = os.time(),
max_epoch = opt.maxEpoch
}
xp:run(datasource)
You have two options.
One. Use the encapsulated nn.Module to forward your torch.Tensor:
mlp = model:toModule(datasource:trainSet():sub(1,2))
mlp:float()
input = torch.FloatTensor(1, 1, 32, 32) -- replace this with your input
output = mlp:forward(input)
Two. Encapsulate your torch.Tensor into a dp.ImageView and forward that through your dp.Model :
input = torch.FloatTensor(1, 1, 32, 32) -- replace with your input
inputView = dp.ImageView('bchw', input)
outputView = mlp:forward(inputView, dp.Carry{nSample=1})
output = outputView:forward('b')

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