def __init__(self, settingsDict, dataset, networkConfig={}):
"""Initializing Models for the method """
self.HPs.update({
"LearningRate": 0.0001,
"LatentSize": 64,
"Optimizer": "Adam",
"Epochs": 10,
})
self.requiredParams.Append([
"GenNetworkConfig",
"DiscNetworkConfig",
])
super().__init__(settingsDict)
#Processing Other inputs
self.inputSpec = dataset.inputSpec
networkConfig.update(dataset.outputSpec)
self.Generator = CreateModel(self.HPs["GenNetworkConfig"],
{"latent": self.HPs["LatentSize"]},
variables=networkConfig,
printSummary=True)
self.Discriminator = CreateModel(self.HPs["DiscNetworkConfig"],
dataset.inputSpec,
variables=networkConfig,
printSummary=True)
self.generatorOptimizer = GetOptimizer(self.HPs["Optimizer"],
self.HPs["LearningRate"])
self.discriminatorOptimizer = GetOptimizer(self.HPs["Optimizer"],
self.HPs["LearningRate"])
self.crossEntropy = tf.keras.losses.BinaryCrossentropy(
from_logits=False)
def __init__(self, settingsDict, dataset, networkConfig={}):
"""Autoencoder test method. This implementation runs about 4-8% slower than the base Autoencoding method."""
self.HPs.update({
"LearningRate": 0.00005,
"LatentSize": 64,
"Optimizer": "Adam",
"Epochs": 10,
"BatchSize": 64,
})
self.requiredParams.Append([
"GenNetworkConfig",
"EncNetworkConfig",
])
super().__init__(settingsDict)
#Processing Other inputs
self.inputSpec = dataset.inputSpec
networkConfig.update(dataset.outputSpec)
networkConfig.update({"LatentSize": self.HPs["LatentSize"]})
self.Generator = CreateModel(self.HPs["GenNetworkConfig"],
{"latent": self.HPs["LatentSize"]},
variables=networkConfig,
printSummary=True)
self.Encoder = CreateModel(self.HPs["EncNetworkConfig"],
dataset.inputSpec,
variables=networkConfig,
printSummary=True)
self.optimizer = GetOptimizer(self.HPs["Optimizer"],
self.HPs["LearningRate"])
self.mse = tf.keras.losses.MeanSquaredError()
def __init__(self, settingsDict, dataset, networkConfig={}):
"""Initializing Model and all Hyperparameters """
self.HPs.update({
"LearningRate": 0.00005,
"LatentSize": 64,
"Optimizer": "Adam",
"Epochs": 10,
"BatchSize": 64,
})
self.requiredParams.Append([
"NetworkConfig",
])
super().__init__(settingsDict)
#Processing Other inputs
self.inputSpec = dataset.inputSpec
networkConfig.update(dataset.outputSpec)
self.Model = CreateModel(self.HPs["NetworkConfig"],
dataset.inputSpec,
variables=networkConfig,
printSummary=True)
self.optimizer = GetOptimizer(self.HPs["Optimizer"],
self.HPs["LearningRate"])
self.mse = tf.keras.losses.MeanSquaredError()
def __init__(self,settingsDict,dataset,networkConfig={}):
"""Initializing Model and all Hyperparameters """
self.HPs.update({
"LearningRate":0.00005,
"LatentSize":64,
"Optimizer":"Adam",
"Epochs":10,
"BatchSize":32,
"Shuffle":True,
})
self.requiredParams.Append([
"GenNetworkConfig",
"DiscNetworkConfig",
"EncNetworkConfig",
])
super().__init__(settingsDict)
#Processing Other inputs
self.inputSpec=dataset.inputSpec
self.opt = GetOptimizer(self.HPs["Optimizer"],self.HPs["LearningRate"])
networkConfig.update(dataset.outputSpec)
networkConfig.update({"LatentSize":self.HPs["LatentSize"]})
self.Generator = CreateModel(self.HPs["GenNetworkConfig"],{"latent":self.HPs["LatentSize"]},variables=networkConfig,printSummary=True)
self.Encoder = CreateModel(self.HPs["EncNetworkConfig"],dataset.inputSpec,variables=networkConfig,printSummary=True)
_datasetSpec = {"features":[self.HPs["LatentSize"]],**dataset.inputSpec}
self.Discriminator = CreateModel(self.HPs["DiscNetworkConfig"],_datasetSpec,variables=networkConfig,printSummary=True)
self.generatorOptimizer = GetOptimizer(self.HPs["Optimizer"],self.HPs["LearningRate"])
self.discriminatorOptimizer = GetOptimizer(self.HPs["Optimizer"],self.HPs["LearningRate"])
self.crossEntropy = tf.keras.losses.BinaryCrossentropy(from_logits=True)
class Autoencoder(BaseMethod):
def __init__(self, settingsDict, dataset, networkConfig={}):
"""Initializing Model and all Hyperparameters """
self.HPs.update({
"LearningRate": 0.00005,
"LatentSize": 64,
"Optimizer": "Adam",
"Epochs": 10,
"BatchSize": 64,
})
self.requiredParams.Append([
"NetworkConfig",
])
super().__init__(settingsDict)
#Processing Other inputs
self.inputSpec = dataset.inputSpec
networkConfig.update(dataset.outputSpec)
self.Model = CreateModel(self.HPs["NetworkConfig"],
dataset.inputSpec,
variables=networkConfig,
printSummary=True)
self.optimizer = GetOptimizer(self.HPs["Optimizer"],
self.HPs["LearningRate"])
self.mse = tf.keras.losses.MeanSquaredError()
@tf.function
def TrainStep(self, images):
with tf.GradientTape() as tape:
generatedImages = self.Model(images, training=True)["Decoder"]
loss = self.mse(images["image"], generatedImages)
gradients = tape.gradient(loss, self.Model.trainable_variables)
self.optimizer.apply_gradients(
zip(gradients, self.Model.trainable_variables))
return {"Autoencoder Loss": loss}
def ImagesFromImage(self, testImages):
return self.Model.predict({"image": testImages})["Decoder"]
def LatentFromImage(self, testImages):
return self.Model.predict({"image": testImages})["Latent"]
def AnomalyScore(self, testImages):
return tf.reduce_sum(
(testImages - self.ImagesFromImage(testImages))**2,
axis=list(range(1, len(testImages.shape))))
def __init__(self, settingsDict, dataset, networkConfig={}):
"""Initializing Model and all Hyperparameters """
self.HPs = {
"LearningRate": 0.00005,
"Optimizer": "Adam",
"Epochs": 10,
"BatchSize": 64,
"Shuffle": True,
}
self.requiredParams = [
"NetworkConfig",
]
#Chacking Valid hyperparameters are specified
CheckFilled(self.requiredParams, settingsDict["NetworkHPs"])
self.HPs.update(settingsDict["NetworkHPs"])
#Processing Other inputs
self.opt = GetOptimizer(self.HPs["Optimizer"],
self.HPs["LearningRate"])
networkConfig.update(dataset.outputSpec)
self.Model = CreateModel(self.HPs["NetworkConfig"],
dataset.inputSpec,
variables=networkConfig)
self.Model.compile(optimizer=self.opt,
loss=["mse"],
metrics=['accuracy'])
self.Model.summary(print_fn=log.info)
self.LoadModel({"modelPath": "models/Test"})
def __init__(self, settingsDict, dataset, networkConfig={}):
"""Autoencoder test method. This implementation runs about 5-10% slower than the base Autoencoding method."""
self.HPs.update({
"LearningRate": 0.00005,
"Optimizer": "Adam",
"Epochs": 10,
"LatentSize": 64,
"BatchSize": 64,
"Shuffle": True,
})
self.requiredParams.Append([
"NetworkConfig",
])
super().__init__(settingsDict)
#Processing Other inputs
self.opt = GetOptimizer(self.HPs["Optimizer"],
self.HPs["LearningRate"])
networkConfig.update(dataset.outputSpec)
networkConfig.update({"LatentSize": self.HPs["LatentSize"]})
self.Model = CreateModel(self.HPs["NetworkConfig"],
dataset.inputSpec,
variables=networkConfig,
printSummary=True)
self.Model.compile(optimizer=self.opt, loss=["mse"], metrics=[])
def __init__(self, settingsDict, dataset, networkConfig={}):
"""Initializing Model and all Hyperparameters """
self.HPs.update({
"LearningRate": 0.00005,
"LatentSize": 64,
"Optimizer": "RMS",
"Epochs": 10,
"DiscrimClipValue": 0.01,
"GenUpdateFreq": 5,
})
self.requiredParams.Append([
"GenNetworkConfig",
"DiscNetworkConfig",
])
super().__init__(settingsDict)
#Processing Other inputs
self.inputSpec = dataset.inputSpec
networkConfig.update(dataset.outputSpec)
self.Generator = CreateModel(self.HPs["GenNetworkConfig"],
{"latent": self.HPs["LatentSize"]},
variables=networkConfig,
printSummary=True)
self.Discriminator = CreateModel(self.HPs["DiscNetworkConfig"],
dataset.inputSpec,
variables=networkConfig,
printSummary=True)
self.generatorOptimizer = GetOptimizer(self.HPs["Optimizer"],
self.HPs["LearningRate"])
self.discriminatorOptimizer = GetOptimizer(self.HPs["Optimizer"],
self.HPs["LearningRate"])
self.counter = 0
def __init__(self, settingsDict, dataset, networkConfig={}):
"""Initializing Model and all Hyperparameters """
self.HPs.update({
"LearningRate": 0.00005,
"LatentSize": 16,
"Optimizer": "Adam",
"Epochs": 10,
"w_adv": 1,
"w_con": 50,
"w_enc": 1,
})
self.requiredParams.Append([
"GenNetworkConfig",
"EncNetworkConfig",
"DiscNetworkConfig",
])
super().__init__(settingsDict)
#Processing Other inputs
networkConfig.update(dataset.outputSpec)
networkConfig.update({"LatentSize": self.HPs["LatentSize"]})
self.Generator = CreateModel(self.HPs["GenNetworkConfig"],
{"latent": self.HPs["LatentSize"]},
variables=networkConfig,
printSummary=True)
self.Discriminator = CreateModel(self.HPs["DiscNetworkConfig"],
dataset.inputSpec,
variables=networkConfig,
printSummary=True)
self.Encoder = CreateModel(self.HPs["EncNetworkConfig"],
dataset.inputSpec,
variables=networkConfig,
printSummary=True)
self.Encoder2 = CreateModel(self.HPs["EncNetworkConfig"],
dataset.inputSpec,
variables=networkConfig)
self.generatorOptimizer = GetOptimizer(self.HPs["Optimizer"],
self.HPs["LearningRate"])
self.discriminatorOptimizer = GetOptimizer(self.HPs["Optimizer"],
self.HPs["LearningRate"])
self.encoderOptimizer = GetOptimizer(self.HPs["Optimizer"],
self.HPs["LearningRate"])
self.crossEntropy = tf.keras.losses.BinaryCrossentropy(
from_logits=False)
class GAN(BaseMethod):
def __init__(self, settingsDict, dataset, networkConfig={}):
"""Initializing Models for the method """
self.HPs.update({
"LearningRate": 0.0001,
"LatentSize": 64,
"Optimizer": "Adam",
"Epochs": 10,
})
self.requiredParams.Append([
"GenNetworkConfig",
"DiscNetworkConfig",
])
super().__init__(settingsDict)
#Processing Other inputs
self.inputSpec = dataset.inputSpec
networkConfig.update(dataset.outputSpec)
self.Generator = CreateModel(self.HPs["GenNetworkConfig"],
{"latent": self.HPs["LatentSize"]},
variables=networkConfig,
printSummary=True)
self.Discriminator = CreateModel(self.HPs["DiscNetworkConfig"],
dataset.inputSpec,
variables=networkConfig,
printSummary=True)
self.generatorOptimizer = GetOptimizer(self.HPs["Optimizer"],
self.HPs["LearningRate"])
self.discriminatorOptimizer = GetOptimizer(self.HPs["Optimizer"],
self.HPs["LearningRate"])
self.crossEntropy = tf.keras.losses.BinaryCrossentropy(
from_logits=False)
@tf.function
def TrainStep(self, images):
randomLatent = tf.random.normal(
[self.HPs["BatchSize"], self.HPs["LatentSize"]])
with tf.GradientTape() as genTape, tf.GradientTape() as discTape:
generatedImages = self.Generator(randomLatent,
training=True)["Decoder"]
realPred = self.Discriminator(images, training=True)["Discrim"]
fakePred = self.Discriminator({"image": generatedImages},
training=True)["Discrim"]
genLoss = self.crossEntropy(tf.ones_like(fakePred), fakePred)
discLoss = self.crossEntropy(tf.ones_like(realPred), realPred) + \
self.crossEntropy(tf.zeros_like(fakePred), fakePred)
generatorGradients = genTape.gradient(
genLoss, self.Generator.trainable_variables)
discriminatorGradients = discTape.gradient(
discLoss, self.Discriminator.trainable_variables)
self.generatorOptimizer.apply_gradients(
zip(generatorGradients, self.Generator.trainable_variables))
self.discriminatorOptimizer.apply_gradients(
zip(discriminatorGradients,
self.Discriminator.trainable_variables))
return {"Generator Loss": genLoss, "Discriminator Loss": discLoss}
def ImagesFromLatent(self, sample):
return self.Generator.predict(sample)["Decoder"]
class GANomaly(BaseMethod):
def __init__(self, settingsDict, dataset, networkConfig={}):
"""Initializing Model and all Hyperparameters """
self.HPs.update({
"LearningRate": 0.00005,
"LatentSize": 16,
"Optimizer": "Adam",
"Epochs": 10,
"w_adv": 1,
"w_con": 50,
"w_enc": 1,
})
self.requiredParams.Append([
"GenNetworkConfig",
"EncNetworkConfig",
"DiscNetworkConfig",
])
super().__init__(settingsDict)
#Processing Other inputs
networkConfig.update(dataset.outputSpec)
networkConfig.update({"LatentSize": self.HPs["LatentSize"]})
self.Generator = CreateModel(self.HPs["GenNetworkConfig"],
{"latent": self.HPs["LatentSize"]},
variables=networkConfig,
printSummary=True)
self.Discriminator = CreateModel(self.HPs["DiscNetworkConfig"],
dataset.inputSpec,
variables=networkConfig,
printSummary=True)
self.Encoder = CreateModel(self.HPs["EncNetworkConfig"],
dataset.inputSpec,
variables=networkConfig,
printSummary=True)
self.Encoder2 = CreateModel(self.HPs["EncNetworkConfig"],
dataset.inputSpec,
variables=networkConfig)
self.generatorOptimizer = GetOptimizer(self.HPs["Optimizer"],
self.HPs["LearningRate"])
self.discriminatorOptimizer = GetOptimizer(self.HPs["Optimizer"],
self.HPs["LearningRate"])
self.encoderOptimizer = GetOptimizer(self.HPs["Optimizer"],
self.HPs["LearningRate"])
self.crossEntropy = tf.keras.losses.BinaryCrossentropy(
from_logits=False)
def Train(self, data, callbacks=[]):
self.InitializeCallbacks(callbacks)
trainDataset = self.SetupDataset(data)
for epoch in range(self.HPs["Epochs"]):
ts = time.time()
for batch in trainDataset:
info1 = {}
info2 = self.TrainStepXZX(batch)
self.ExecuteEpochEndCallbacks(epoch, {**info1, **info2})
log.info("End Epoch {}: Time {}".format(epoch, time.time() - ts))
self.ExecuteTrainEndCallbacks({})
@tf.function
def TrainStepGAN(self, images):
randomLatent = tf.random.normal(
[self.HPs["BatchSize"], self.HPs["LatentSize"]])
with tf.GradientTape() as genTape, tf.GradientTape() as discTape:
generatedImages = self.Generator(randomLatent,
training=True)["Decoder"]
realOutput = self.Discriminator(images, training=True)
fakeOutput = self.Discriminator({"image": generatedImages},
training=True)
realPred = realOutput["Discrim"]
realFeatures = realOutput["Features"]
fakePred = fakeOutput["Discrim"]
fakeFeatures = fakeOutput["Features"]
genLoss = self.crossEntropy(tf.ones_like(fakePred), fakePred)
featLoss = tf.reduce_mean(realFeatures - fakeFeatures)**2.0
discLoss = self.crossEntropy(tf.ones_like(realPred), realPred) + \
self.crossEntropy(tf.zeros_like(fakePred), fakePred)
genAllLoss = genLoss # + feat_loss
generatorGradients = genTape.gradient(
genAllLoss, self.Generator.trainable_variables)
discriminatorGradients = discTape.gradient(
discLoss, self.Discriminator.trainable_variables)
self.generatorOptimizer.apply_gradients(
zip(generatorGradients, self.Generator.trainable_variables))
self.discriminatorOptimizer.apply_gradients(
zip(discriminatorGradients,
self.Discriminator.trainable_variables))
return {"Generator Loss": genLoss, "Discriminator Loss": discLoss}
# @tf.function
def TrainStepXZX(self, images):
with tf.GradientTape() as genTape, tf.GradientTape(
) as encTape, tf.GradientTape() as discTape:
z = self.Encoder(images, training=True)["Latent"]
x_hat = self.Generator(z, training=True)["Decoder"]
z_hat = self.Encoder2(x_hat, training=True)["Latent"]
realOutput = self.Discriminator(images, training=True)
fakeOutput = self.Discriminator(x_hat, training=True)
realPred = realOutput["Discrim"]
realFeatures = realOutput["Features"]
fakePred = fakeOutput["Discrim"]
fakeFeatures = fakeOutput["Features"]
genLoss = self.crossEntropy(tf.ones_like(fakePred), fakePred)
featLoss = tf.reduce_mean(realFeatures - fakeFeatures)**2.0
discLoss = self.crossEntropy(tf.ones_like(realPred), realPred) + \
self.crossEntropy(tf.zeros_like(fakePred), fakePred)
encoderLoss = tf.reduce_mean((z_hat - z)**2)
contextLoss = tf.reduce_mean(tf.math.abs(x_hat - images["image"]))
totalLoss = encoderLoss + contextLoss + genLoss + featLoss
generatorGradients = genTape.gradient(
totalLoss, self.Generator.trainable_variables)
discriminatorGradients = discTape.gradient(
totalLoss, self.Discriminator.trainable_variables)
encoderGradients = encTape.gradient(
totalLoss, self.Encoder.trainable_variables +
self.Encoder2.trainable_variables)
self.generatorOptimizer.apply_gradients(
zip(generatorGradients, self.Generator.trainable_variables))
self.encoderOptimizer.apply_gradients(
zip(
encoderGradients, self.Encoder.trainable_variables +
self.Encoder2.trainable_variables))
self.discriminatorOptimizer.apply_gradients(
zip(discriminatorGradients,
self.Discriminator.trainable_variables))
return {
"Generator Loss": genLoss,
"Discriminator Loss": discLoss,
"Feature Loss": featLoss,
"Encoding Loss": encoderLoss,
"Construction Loss": contextLoss
}
def InitializeCallbacks(self, callbacks):
"""Method initializes callbacks for training loops that are not `model.fit()`.
Pass any params that the callbacks need into the generation of the callback list.
For methods with multiple networks, pass them is as dictionaries.
This requires callbacks that are compatible with the dictionary style of model usage.
This style is compatible with the `method.fit()` method b/c code nests the inputed model variable without performing checks.
Future it might be desirable to create a custom model nesting logic that will allow callbacks like `ModelCheckpoint` to be compatible.
"""
self.callbacks = tf.keras.callbacks.CallbackList(
callbacks, model=self, LatentSize=self.HPs["LatentSize"])
def LatentFromImage(self, sample):
return self.Encoder.predict(sample)["Latent"]
def ImagesFromLatent(self, sample):
return self.Generator.predict(sample)["Decoder"]
def ImagesFromImage(self, testImages):
z = self.Encoder.predict({"image": testImages})["Latent"]
return self.Generator.predict({"latent": z})["Decoder"]
def AnomalyScore(self, testImages):
return tf.reduce_sum(
(testImages - self.ImagesFromImage(testImages))**2,
axis=list(range(1, len(testImages.shape))))
class Autoencoder_v3(BaseMethod):
def __init__(self, settingsDict, dataset, networkConfig={}):
"""Autoencoder test method. This implementation runs about 4-8% slower than the base Autoencoding method."""
self.HPs.update({
"LearningRate": 0.00005,
"LatentSize": 64,
"Optimizer": "Adam",
"Epochs": 10,
"BatchSize": 64,
})
self.requiredParams.Append([
"GenNetworkConfig",
"EncNetworkConfig",
])
super().__init__(settingsDict)
#Processing Other inputs
self.inputSpec = dataset.inputSpec
networkConfig.update(dataset.outputSpec)
networkConfig.update({"LatentSize": self.HPs["LatentSize"]})
self.Generator = CreateModel(self.HPs["GenNetworkConfig"],
{"latent": self.HPs["LatentSize"]},
variables=networkConfig,
printSummary=True)
self.Encoder = CreateModel(self.HPs["EncNetworkConfig"],
dataset.inputSpec,
variables=networkConfig,
printSummary=True)
self.optimizer = GetOptimizer(self.HPs["Optimizer"],
self.HPs["LearningRate"])
self.mse = tf.keras.losses.MeanSquaredError()
@tf.function
def TrainStep(self, images):
with tf.GradientTape() as tape:
latent = self.Encoder(images, training=True)["Latent"]
generatedImages = self.Generator(latent, training=True)["Decoder"]
loss = self.mse(images["image"], generatedImages)
gradients = tape.gradient(
loss, self.Generator.trainable_variables +
self.Encoder.trainable_variables)
self.optimizer.apply_gradients(
zip(
gradients, self.Generator.trainable_variables +
self.Encoder.trainable_variables))
return {"Autoencoder Loss": loss}
def ImagesFromLatent(self, sample):
return self.Generator.predict(sample)["Decoder"]
def ImagesFromImage(self, testImages):
latent = self.Encoder.predict({"image": testImages})["Latent"]
return self.Generator.predict({"latent": latent})["Decoder"]
def AnomalyScore(self, testImages):
return tf.reduce_sum(
(testImages - self.ImagesFromImage(testImages))**2,
axis=list(range(1, len(testImages.shape))))
def LatentFromImage(self, sample):
return self.Encoder.predict(sample)["Latent"]
class WGAN(BaseMethod):
def __init__(self, settingsDict, dataset, networkConfig={}):
"""Initializing Model and all Hyperparameters """
self.HPs.update({
"LearningRate": 0.00005,
"LatentSize": 64,
"Optimizer": "RMS",
"Epochs": 10,
"DiscrimClipValue": 0.01,
"GenUpdateFreq": 5,
})
self.requiredParams.Append([
"GenNetworkConfig",
"DiscNetworkConfig",
])
super().__init__(settingsDict)
#Processing Other inputs
self.inputSpec = dataset.inputSpec
networkConfig.update(dataset.outputSpec)
self.Generator = CreateModel(self.HPs["GenNetworkConfig"],
{"latent": self.HPs["LatentSize"]},
variables=networkConfig,
printSummary=True)
self.Discriminator = CreateModel(self.HPs["DiscNetworkConfig"],
dataset.inputSpec,
variables=networkConfig,
printSummary=True)
self.generatorOptimizer = GetOptimizer(self.HPs["Optimizer"],
self.HPs["LearningRate"])
self.discriminatorOptimizer = GetOptimizer(self.HPs["Optimizer"],
self.HPs["LearningRate"])
self.counter = 0
def Train(self, data, callbacks=[]):
self.InitializeCallbacks(callbacks)
trainDataset = self.SetupDataset(data)
for epoch in range(self.HPs["Epochs"]):
ts = time.time()
for batch in trainDataset:
trainGen = (self.counter % self.HPs["GenUpdateFreq"] == 0)
info = self.TrainStep(batch, trainGen)
self.ClipDiscriminator()
self.counter += 1
self.ExecuteEpochEndCallbacks(epoch, info)
log.info("End Epoch {}: Time {}".format(epoch, time.time() - ts))
self.ExecuteTrainEndCallbacks({})
@tf.function
def TrainStep(self, images, trainGen=True):
randomLatent = tf.random.normal(
[self.HPs["BatchSize"], self.HPs["LatentSize"]])
with tf.GradientTape() as genTape, tf.GradientTape() as discTape:
generatedImages = self.Generator(randomLatent,
training=True)["Decoder"]
realPred = self.Discriminator(images, training=True)["Discrim"]
fakePred = self.Discriminator({"image": generatedImages},
training=True)["Discrim"]
genLoss = -tf.reduce_sum(fakePred)
discLoss = -tf.reduce_mean(realPred) + tf.reduce_mean(fakePred)
if trainGen:
generatorGradients = genTape.gradient(
genLoss, self.Generator.trainable_variables)
self.generatorOptimizer.apply_gradients(
zip(generatorGradients, self.Generator.trainable_variables))
discriminatorGradients = discTape.gradient(
discLoss, self.Discriminator.trainable_variables)
self.discriminatorOptimizer.apply_gradients(
zip(discriminatorGradients,
self.Discriminator.trainable_variables))
return {"Generator Loss": genLoss, "Discriminator Loss": discLoss}
@tf.function()
def ClipDiscriminator(self):
"""
Clips parameters of the discriminator network.
Parameters
----------
N/A
Returns
-------
N/A
"""
for params in self.Discriminator.variables:
params.assign(
tf.clip_by_value(params, -self.HPs["DiscrimClipValue"],
self.HPs["DiscrimClipValue"]))
def ImagesFromLatent(self, sample):
return self.Generator.predict(sample)["Decoder"]
class BiGAN(BaseMethod):
def __init__(self,settingsDict,dataset,networkConfig={}):
"""Initializing Model and all Hyperparameters """
self.HPs.update({
"LearningRate":0.00005,
"LatentSize":64,
"Optimizer":"Adam",
"Epochs":10,
"BatchSize":32,
"Shuffle":True,
})
self.requiredParams.Append([
"GenNetworkConfig",
"DiscNetworkConfig",
"EncNetworkConfig",
])
super().__init__(settingsDict)
#Processing Other inputs
self.inputSpec=dataset.inputSpec
self.opt = GetOptimizer(self.HPs["Optimizer"],self.HPs["LearningRate"])
networkConfig.update(dataset.outputSpec)
networkConfig.update({"LatentSize":self.HPs["LatentSize"]})
self.Generator = CreateModel(self.HPs["GenNetworkConfig"],{"latent":self.HPs["LatentSize"]},variables=networkConfig,printSummary=True)
self.Encoder = CreateModel(self.HPs["EncNetworkConfig"],dataset.inputSpec,variables=networkConfig,printSummary=True)
_datasetSpec = {"features":[self.HPs["LatentSize"]],**dataset.inputSpec}
self.Discriminator = CreateModel(self.HPs["DiscNetworkConfig"],_datasetSpec,variables=networkConfig,printSummary=True)
self.generatorOptimizer = GetOptimizer(self.HPs["Optimizer"],self.HPs["LearningRate"])
self.discriminatorOptimizer = GetOptimizer(self.HPs["Optimizer"],self.HPs["LearningRate"])
self.crossEntropy = tf.keras.losses.BinaryCrossentropy(from_logits=True)
@tf.function
def TrainStep(self,images):
randomLatent = tf.random.normal([self.HPs["BatchSize"], self.HPs["LatentSize"]])
with tf.GradientTape() as genTape, tf.GradientTape() as discTape:
generatedImages = self.Generator(randomLatent, training=True)["Decoder"]
e_z = self.Encoder(images)["Latent"]
realPred = self.Discriminator({**images,"features":e_z}, training=True)["Discrim"]
fakePred = self.Discriminator({"image":generatedImages,"features":randomLatent}, training=True)["Discrim"]
discLoss = self.crossEntropy(tf.ones_like(realPred), realPred) + \
self.crossEntropy(tf.zeros_like(fakePred), fakePred)
genLoss = self.crossEntropy(tf.ones_like(fakePred), fakePred)
encLoss = self.crossEntropy(tf.zeros_like(realPred), realPred)
genAllLoss = genLoss + encLoss
generatorGradients = genTape.gradient(genAllLoss, self.Generator.trainable_variables+self.Encoder.trainable_variables)
discriminatorGradients = discTape.gradient(discLoss, self.Discriminator.trainable_variables)
self.generatorOptimizer.apply_gradients(zip(generatorGradients, self.Generator.trainable_variables+self.Encoder.trainable_variables))
self.discriminatorOptimizer.apply_gradients(zip(discriminatorGradients, self.Discriminator.trainable_variables))
return {"Generator Loss": genLoss,"Discriminator Loss": discLoss,"Encoder Loss": encLoss}
def ImagesFromLatent(self,sample):
return self.Generator.predict(sample)["Decoder"]
def LatentFromImage(self,sample):
return self.Encoder.predict(sample)["Latent"]
def ImagesFromImage(self,testImages):
z = self.Encoder.predict({"image":testImages})["Latent"]
return self.Generator.predict({"latent":z})["Decoder"]
def ImageDiscrim(self,testImages):
z = self.Encoder.predict({"image":testImages})["Latent"]
return self.Discriminator.predict({"image":testImages,"features":z})["Discrim"]
def AnomalyScore(self,testImages,alpha=0.9):
v1 = tf.reduce_sum((testImages-self.ImagesFromImage(testImages))**2,axis=list(range(1,len(testImages.shape))))
v2 = tf.squeeze(self.ImageDiscrim(testImages))
return alpha * v1 + (1-alpha)*v2