def trasfer_learn():
base_model = applications.InceptionV3(include_top=False, weights='imagenet',
input_tensor=Input(shape=(TEST_IMAGE_WIDTH, TEST_IMAGE_HEIGHT, 3)))
x = base_model.output
x = GlobalAveragePooling2D()(x)
x = Dense(512, activation='relu')(x)
x = Dropout(0.5)(x)
predictions = Dense(5, activation='softmax')(x)
train_generator = get_train_generator()
validation_generator = get_test_generator()
model = Model(inputs=base_model.input, outputs=predictions)
for layer in base_model.layers:
layer.trainable = False
model.compile(Adam(lr=.0001), loss='categorical_crossentropy', metrics=['accuracy'])
print(model.summary())
model.fit_generator(
train_generator,
steps_per_epoch=150,
epochs=epochs,
validation_data=validation_generator,
validation_steps=44)
train_eval = model.evaluate_generator(train_generator)
print(train_eval)
test_eval = model.evaluate_generator(validation_generator)
print(test_eval)
model.save(FINETUNE_FULL_MODEL)
model.save_weights(FINETUNE_WEIGHTS)
def evaluate_model(model: keras.Model, datagen, x_valid, y_valid):
"""
Evaluates the model on x_valid, y_valid.
:param model:
:param datagen:
:param x_valid:
:param y_valid:
:return:
"""
print('evaluating model', model.name)
time6 = time.time()
print('metrics:')
labels = ['loss', 'acc', 'sens', 'spec', 'fp', 'tn']
print('labels:', labels)
values = model.evaluate_generator(
datagen.flow(x_valid, y_valid, batch_size=8))
print('values:', values)
# Note that we standardize when we predict x_valid
x_valid: np.ndarray
y_pred = model.predict(datagen.standardize(x_valid.astype(np.float32)))
print('auc score:', sklearn.metrics.roc_auc_score(y_valid, y_pred))
time7 = time.time()
print(f'seconds to evaluate: {time7 - time6}')
return values
def get_accs_times(self,
A,
X,
y,
num_graph_classes,
splits=None,
batch_size=50):
A = map(csr_matrix.todense, A)
A = map(self._add_self_loops, A)
A = map(self._sym_normalise_A, A)
A = list(map(csr_matrix, A))
accuracies = []
times = []
for train_idx, val_idx in iter(splits):
A_test, A_train, X_test, X_train, y_test, y_train \
= self.split_test_train(A, X, y, train_idx, val_idx)
A_in = Input((A[0].shape[0], A[0].shape[1]), name='A_in')
X_in = Input(X[0].shape, name='X_in')
x1 = MyGCN(100, activation='relu')([A_in, X_in])
x2 = MyGCN(64, activation='relu')([A_in, x1])
x3 = Lambda(lambda x: K.mean(x, axis=1))(
x2) if self.with_mean else Flatten()(x2)
x4 = Dense(num_graph_classes, activation='softmax')(x3)
model = Model(inputs=[A_in, X_in], outputs=x4)
# print(model.summary())
model.compile(Adam(),
loss='categorical_crossentropy',
metrics=['acc'])
generator = PiNet().batch_generator([A_train, X_train], y_train,
batch_size)
start = time.time()
model.fit_generator(generator,
ceil(y_train.shape[0] / batch_size),
200,
verbose=0)
train_time = time.time() - start
stats = model.evaluate_generator(
PiNet().batch_generator([A_test, X_test], y_test, batch_size),
y_test.shape[0] / batch_size)
for metric, val in zip(model.metrics_names, stats):
print(metric + ": ", val)
accuracies.append(stats[1])
times.append(train_time)
# print("mean acc:", np.mean(accuracies))
# print("std:", np.std(accuracies))
return accuracies, times
def kfold_cross_validation(model_id: str,
model: Model,
dataset_inputs: np.ndarray = None,
dataset_labels: np.ndarray = None,
train_generator: DirectoryIterator = None,
test_generator: DirectoryIterator = None,
batch_size: int = 32,
epochs: int = 100,
k_folds: int = 5) -> (float, float, float, float):
"""
Performs K-fold cross validation of the given model, returning minimum, average (+ std dev), and maximum accuracy achieved.
Supports generator-based training providing generator instead of dataset_inputs and dataset_labels.
In this case, test_generator has to be provided as well.
In case dataset_inputs, dataset_labels, and test_generator are provided: the validation set will be extracted from
dataset_inputs and dataset_labels, but test_generator will be used when reporting the accuracy score.
:param dataset_inputs: NumPy array representing input samples of the whole training set
:param dataset_labels: NumPy array representing labels of the whole training set
:param train_generator: DirectoryIterator instance for iterating over the training set
:param test_generator: DirectoryIterator instance for iterating over the test set
:param model_id: str identifying the current model being evaluated
:param model: Keras model instance (ATTENTION: must have freshly initialized weights - straight from 'compile()')
:param batch_size: Size of the batch to use (default: 32)
:param epochs: Number of epochs to train the model (default: 100)
:param k_folds: Number of folds to use for CV (default: 5)
:return: (min accuracy, average accuracy, accuracy standard deviation, max accuracy)
"""
assert not (
(dataset_inputs is None or dataset_labels is None)
and train_generator is None
), "dataset_inputs and dataset_labels must be provided if generator is not in use"
assert not (train_generator is not None and test_generator is None
), "test_generator must be provided if generator is in use"
history = []
print("Saving weights...")
model.save_weights("../misc/cv/{model_id}.h5".format(model_id=model_id))
for i in range(1, k_folds + 1):
print("{m} | Iteration {i}/{k}".format(m=model_id, i=i, k=k_folds))
# start with fresh weights
print("Loading weights...")
model.load_weights(
"../misc/cv/{model_id}.h5".format(model_id=model_id))
# early stopping in case validation set accuracy does not increase
early_stopping_callback = CustomEarlyStopping(monitor="val_acc",
patience=5,
min_epochs=int(epochs /
4))
val_acc = 0.
# train the model
print("Training model...")
# dataset-based training
if dataset_inputs is not None and dataset_labels is not None:
# use 80% as training set, remaining 20% as validation set
train_inputs, val_inputs, train_labels, val_labels = train_test_split(
dataset_inputs, dataset_labels, test_size=0.2)
h = model.fit(x=train_inputs,
y=train_labels,
validation_data=(val_inputs, val_labels),
batch_size=batch_size,
epochs=epochs,
verbose=0,
callbacks=[early_stopping_callback])
# model evaluation
if test_generator is not None:
val_acc = model.evaluate_generator(
generator=test_generator,
steps=ceil(test_generator.n / batch_size))
val_acc = val_acc[1]
else:
val_acc = h.history["val_acc"][-1]
# generator-based training
elif train_generator is not None and test_generator is not None:
h = model.fit_generator(
generator=train_generator,
steps_per_epoch=ceil(train_generator.n / batch_size),
validation_data=test_generator,
validation_steps=ceil(test_generator.n / batch_size),
callbacks=[early_stopping_callback],
epochs=epochs,
verbose=0)
# model evaluation
val_acc = h.history["val_acc"][-1]
history.append(val_acc)
print("Training ended/stopped at epoch {e} with accuracy {a:.3f}.".
format(e=early_stopping_callback.stopped_epoch, a=val_acc))
history = np.asarray(history)
return np.min(history), np.mean(history), np.std(history), np.max(history)
def infer_attributes_gat(Gnx, savepred=True, plot=False):
# Define node data
feature_names = [
"in_degree",
"out_degree",
# "in_degree_centrality",
# "out_degree_centrality",
# "closeness_centrality",
# "betweenness_centrality",
"clustering_coefficient",
# "square_clustering",
"core_number",
# "pagerank",
# "constraint",
# "effective_size"
]
node_type = [v for k, v in nx.get_node_attributes(Gnx, 'data').items()]
d = {"node_type": node_type}
if "in_degree" in feature_names:
indeg = [v for k, v in Gnx.in_degree]
indeg = np.divide(indeg, max(indeg))
indeg[indeg >= 0.5] = 1
indeg[indeg < 0.5] = 0
d["in_degree"] = indeg
if "out_degree" in feature_names:
outdeg = [v for k, v in Gnx.out_degree]
outdeg = np.divide(outdeg, max(outdeg))
outdeg[outdeg >= 0.5] = 1
outdeg[outdeg < 0.5] = 0
d["out_degree"] = outdeg
if "in_degree_centrality" in feature_names:
indeg_cent = [
v for k, v in nx.algorithms.in_degree_centrality(Gnx).items()
]
indeg_cent = np.divide(indeg_cent, max(indeg_cent))
indeg_cent[indeg_cent >= 0.5] = 1
indeg_cent[indeg_cent < 0.5] = 0
d["in_degree_centrality"] = indeg_cent
if "out_degree_centrality" in feature_names:
outdeg_cent = [
v for k, v in nx.algorithms.out_degree_centrality(Gnx).items()
]
outdeg_cent = np.divide(outdeg_cent, max(outdeg_cent))
outdeg_cent[outdeg_cent >= 0.5] = 1
outdeg_cent[outdeg_cent < 0.5] = 0
d["out_degree_centrality"] = outdeg_cent
if "closeness_centrality" in feature_names:
close_cent = [
v for k, v in nx.algorithms.closeness_centrality(Gnx).items()
]
close_cent = np.divide(close_cent, max(close_cent))
close_cent[close_cent >= 0.5] = 1
close_cent[close_cent < 0.5] = 0
d["closeness_centrality"] = close_cent
if "betweenness_centrality" in feature_names:
between_cent = [
v for k, v in nx.algorithms.betweenness_centrality(Gnx).items()
]
between_cent = np.divide(between_cent, max(between_cent))
between_cent[between_cent >= 0.5] = 1
between_cent[between_cent < 0.5] = 0
d["betweenness_centrality"] = between_cent
if "clustering_coefficient" in feature_names:
clustering_co = [v for k, v in nx.algorithms.clustering(Gnx).items()]
clustering_co = np.divide(clustering_co, max(clustering_co))
clustering_co[clustering_co >= 0.5] = 1
clustering_co[clustering_co < 0.5] = 0
d["clustering_coefficient"] = clustering_co
if "square_clustering" in feature_names:
sq_clustering = [
v for k, v in nx.algorithms.square_clustering(Gnx).items()
]
sq_clustering = np.divide(sq_clustering, max(sq_clustering))
sq_clustering[sq_clustering >= 0.5] = 1
sq_clustering[sq_clustering < 0.5] = 0
d["square_clustering"] = sq_clustering
if "core_number" in feature_names:
core_number = [v for k, v in nx.algorithms.core_number(Gnx).items()]
core_number = np.divide(core_number, max(core_number))
core_number[core_number >= 0.5] = 1
core_number[core_number < 0.5] = 0
d["core_number"] = core_number
if "pagerank" in feature_names:
pagerank = [v for k, v in nx.algorithms.pagerank(Gnx).items()]
pagerank = np.divide(pagerank, max(pagerank))
pagerank[pagerank >= 0.5] = 1
pagerank[pagerank < 0.5] = 0
d["pagerank"] = pagerank
if "constraint" in feature_names:
constraint = [v for k, v in nx.algorithms.constraint(Gnx).items()]
constraint = np.divide(constraint, max(constraint))
constraint[np.isnan(constraint)] = 0
constraint[constraint >= 0.5] = 1
constraint[constraint < 0.5] = 0
d["constraint"] = constraint
if "effective_size" in feature_names:
effective_size = [
v for k, v in nx.algorithms.effective_size(Gnx).items()
]
effective_size = np.divide(effective_size, max(effective_size))
effective_size[np.isnan(effective_size)] = 0
effective_size[effective_size >= 0.5] = 1
effective_size[effective_size < 0.5] = 0
d["effective_size"] = effective_size
node_data = pd.DataFrame(data=d, index=nodes)
node_data = shuffle(node_data)
# Split the data
train_data, test_data = model_selection.train_test_split(
node_data, train_size=int(0.80 * len(Gnx)))
val_data, test_data = model_selection.train_test_split(
test_data, train_size=int(0.15 * len(Gnx)))
# Convert to numeric arrays
target_encoding = feature_extraction.DictVectorizer(sparse=False)
train_targets = target_encoding.fit_transform(
train_data[["node_type"]].to_dict('records'))
val_targets = target_encoding.transform(val_data[["node_type"
]].to_dict('records'))
test_targets = target_encoding.transform(test_data[["node_type"
]].to_dict('records'))
node_features = node_data[feature_names]
# Create the GAT model in Keras
G = sg.StellarDiGraph(Gnx, node_features=node_features)
print(G.info())
generator = FullBatchNodeGenerator(G)
train_gen = generator.flow(train_data.index, train_targets)
gat = GAT(
layer_sizes=[8, train_targets.shape[1]],
attn_heads=8,
generator=generator,
bias=True,
in_dropout=0.5,
attn_dropout=0.5,
activations=["elu", "softmax"],
normalize=None,
)
# Expose the input and output tensors of the GAT model for node prediction, via GAT.node_model() method:
x_inp, predictions = gat.node_model()
# Train the model
model = Model(inputs=x_inp, outputs=predictions)
model.compile(
optimizer=optimizers.Adam(lr=0.005),
loss=losses.categorical_crossentropy,
weighted_metrics=["acc"],
)
val_gen = generator.flow(val_data.index, val_targets)
if not os.path.isdir(".temp/logs"):
os.makedirs(".temp/logs")
if not os.path.isdir(".temp/output"):
os.makedirs(".temp/output")
es_callback = EarlyStopping(
monitor="val_weighted_acc",
patience=
100 # patience is the number of epochs to wait before early stopping in case of no further improvement
)
mc_callback = ModelCheckpoint(
".temp/logs/best_model.h5",
monitor="val_weighted_acc",
save_best_only=True,
save_weights_only=True,
)
history = model.fit_generator(
train_gen,
epochs=2000,
validation_data=val_gen,
verbose=2,
shuffle=
False, # this should be False, since shuffling data means shuffling the whole graph
callbacks=[es_callback, mc_callback],
)
# Reload the saved weights
model.load_weights(".temp/logs/best_model.h5")
# Evaluate the best nidek in the test set
test_gen = generator.flow(test_data.index, test_targets)
test_metrics = model.evaluate_generator(test_gen)
print("\nTest Set Metrics:")
for name, val in zip(model.metrics_names, test_metrics):
print("\t{}: {:0.4f}".format(name, val))
# Make predictions with the model
all_nodes = node_data.index
all_gen = generator.flow(all_nodes)
all_predictions = model.predict_generator(all_gen)
node_predictions = target_encoding.inverse_transform(all_predictions)
results = pd.DataFrame(node_predictions, index=G.nodes()).idxmax(axis=1)
df = pd.DataFrame({"Predicted": results, "True": node_data['node_type']})
print(df.head)
if savepred:
df.to_excel(".temp/output/output" +
str(datetime.datetime.now()).replace(':', '-') + ".xlsx")
if plot:
# Node embeddings
emb_layer = model.layers[3]
print("Embedding layer: {}, output shape {}".format(
emb_layer.name, emb_layer.output_shape))
embedding_model = Model(inputs=x_inp, outputs=emb_layer.output)
emb = embedding_model.predict_generator(all_gen)
X = emb
y = np.argmax(target_encoding.transform(
node_data.reindex(G.nodes())[["node_type"]].to_dict('records')),
axis=1)
if X.shape[1] > 2:
transform = TSNE #PCA
trans = transform(n_components=2)
emb_transformed = pd.DataFrame(trans.fit_transform(X),
index=list(G.nodes()))
emb_transformed['label'] = y
else:
emb_transformed = pd.DataFrame(X, index=list(G.nodes()))
emb_transformed = emb_transformed.rename(columns={'0': 0, '1': 1})
def plot_emb(transform, emb_transformed):
fig, ax = plt.subplots(figsize=(7, 7))
ax.scatter(emb_transformed[0],
emb_transformed[1],
c=emb_transformed['label'].astype("category"),
cmap="jet",
alpha=0.7)
ax.set(aspect="equal", xlabel="$X_1$", ylabel="$X_2$")
plt.title(
'{} visualization of GAT embeddings for the fighter graph'.
format(transform.__name__))
# Plot the training history
def remove_prefix(text, prefix):
return text[text.startswith(prefix) and len(prefix):]
def plot_history(history):
metrics = sorted(
set([
remove_prefix(m, "val_")
for m in list(history.history.keys())
]))
for m in metrics:
# summarize history for metric m
plt.figure()
plt.plot(history.history[m])
plt.plot(history.history['val_' + m])
plt.title(m)
plt.ylabel(m)
plt.xlabel('epoch')
plt.legend(['train', 'validation'], loc='best')
plot_history(history)
plot_emb(transform, emb_transformed)
plt.show()
return df
def model_mnist():
(X_train, Y_train), (X_test, Y_test) = mnist.load_data() # 28*28
X_train = X_train.astype('float32').reshape(-1, 28, 28, 1)
X_test = X_test.astype('float32').reshape(-1, 28, 28, 1)
X_train /= 255
X_test /= 255
print('Train:{},Test:{}'.format(len(X_train), len(X_test)))
nb_classes = 10
Y_train = np_utils.to_categorical(Y_train, nb_classes)
Y_test = np_utils.to_categorical(Y_test, nb_classes)
print('data success')
input_tensor = Input((28, 28, 1))
#28*28
temp = Conv2D(filters=32,
kernel_size=(3, 3),
padding='valid',
use_bias=False)(input_tensor)
temp = Activation('relu')(temp)
#26*26
temp = MaxPooling2D(pool_size=(2, 2))(temp)
#13*13
temp = Conv2D(filters=64,
kernel_size=(3, 3),
padding='valid',
use_bias=False)(temp)
temp = Activation('relu')(temp)
#11*11
temp = MaxPooling2D(pool_size=(2, 2))(temp)
#5*5
temp = Conv2D(filters=128,
kernel_size=(3, 3),
padding='valid',
use_bias=False)(temp)
temp = Activation('relu')(temp)
#3*3
temp = Flatten()(temp)
temp = Dense(nb_classes)(temp)
output = Activation('softmax')(temp)
model = Model(input=input_tensor, outputs=output)
model.summary()
sgd = SGD(lr=0.01, decay=1e-6, momentum=0.9, nesterov=True)
model.compile(loss='categorical_crossentropy',
optimizer=sgd,
metrics=['accuracy'])
datagen = ImageDataGenerator(rotation_range=20,
width_shift_range=0.1,
height_shift_range=0.1)
batch_size = 32
model.fit_generator(datagen.flow(X_train, Y_train, batch_size=batch_size),
steps_per_epoch=len(X_train) // batch_size,
epochs=5,
validation_data=(X_test, Y_test))
#model.fit(X_train, Y_train, batch_size=64, nb_epoch=5,validation_data=(X_test, Y_test))
#Y_pred = model.predict(X_test, verbose=0)
score_org = model.evaluate(X_test, Y_test, verbose=0)
score_aug = model.evaluate_generator(
datagen.flow(X_test, Y_test, batch_size=32))
print('测试集 score(val_loss): %.4f' % score_org[0])
print('测试集 accuracy: %.4f' % score_aug[1])
model.save('./model/model.hdf5')
return score_org[1], score_aug[1]
def main(args):
num_of_folds = len(os.listdir(args.data_path))
print("Found {} number of folds".format(num_of_folds))
for fold_index in range(num_of_folds):
print("================================")
print("Starting fold {}".format(fold_index))
#Create dataset
dataset = TGSDataset(data_path="{}/fold_{}".format(
args.data_path, fold_index),
batch_size=args.batch_size)
input_shape = (args.target_size, args.target_size)
mask_shape = (101, 101)
train_data_generator = dataset.get_train_data_generator(
input_size=input_shape, mask_size=mask_shape, seed=args.seed)
val_data_generator = dataset.get_val_data_generator(
input_size=input_shape, mask_size=mask_shape, seed=args.seed)
#Find best saved model
best_model_file = 'weights/{}/fold_{}_{epoch}_best.h5'.format(
args.model, fold_index, epoch='{epoch}')
resume_from_epoch = 0
for try_epoch in range(args.epochs, 0, -1):
if os.path.exists(best_model_file.format(epoch=try_epoch)):
resume_from_epoch = try_epoch
break
if resume_from_epoch > 0:
print("Resuming from epoch {}".format(resume_from_epoch))
model = load_model(best_model_file.format(epoch=resume_from_epoch),
custom_objects={'c_iou': metrics.c_iou})
else:
model = make_model(args.model,
(args.target_size, args.target_size, 3), 1)
#Optimizer
opt = adam(lr=args.learning_rate)
#Compile model
model.compile(loss=binary_crossentropy,
optimizer=opt,
metrics=[binary_accuracy, metrics.c_iou])
#Keras callbacks
callbacks = [
keras.callbacks.TensorBoard(args.log_dir),
keras.callbacks.ModelCheckpoint(best_model_file,
save_best_only=True,
save_weights_only=False),
keras.callbacks.EarlyStopping(monitor='c_iou',
patience=20,
verbose=0,
mode='max')
]
train_step_size = dataset.train_step_size
val_step_size = dataset.val_step_size
history = model.fit_generator(train_data_generator,
steps_per_epoch=train_step_size,
callbacks=callbacks,
epochs=args.epochs,
verbose=args.v,
workers=4,
initial_epoch=resume_from_epoch,
validation_data=val_data_generator,
validation_steps=val_step_size)
#Load weights
resume_from_epoch = 0
for try_epoch in range(args.epochs, 0, -1):
if os.path.exists(best_model_file.format(epoch=try_epoch)):
resume_from_epoch = try_epoch
break
if resume_from_epoch > 0:
print("Resuming from epoch {}".format(resume_from_epoch))
model_with_lovasz = load_model(
best_model_file.format(epoch=resume_from_epoch),
custom_objects={"c_iou": metrics.c_iou})
else:
model_with_lovasz = make_model(
args.model, (args.target_size, args.target_size, 3), 1)
#Lovasz Loss
#Optimizer
#Keras callbacks
callbacks = [
keras.callbacks.TensorBoard(args.log_dir),
keras.callbacks.ModelCheckpoint(best_model_file,
save_best_only=True,
save_weights_only=False),
keras.callbacks.EarlyStopping(monitor='c_iou_zero',
mode='max',
patience=20,
verbose=0)
]
train_data_generator = dataset.get_train_data_generator(
input_size=input_shape, mask_size=mask_shape, seed=args.seed)
val_data_generator = dataset.get_val_data_generator(
input_size=input_shape, mask_size=mask_shape, seed=args.seed)
model_with_lovasz = Model(model_with_lovasz.layers[0].input,
model_with_lovasz.layers[-1].input)
opt = adam(lr=args.learning_rate)
model_with_lovasz.compile(
loss=losses.c_lovasz_loss,
optimizer=opt,
metrics=[binary_accuracy, metrics.c_iou_zero])
print("Fine tuning with lovasz loss")
model_with_lovasz.fit_generator(train_data_generator,
steps_per_epoch=train_step_size,
callbacks=callbacks,
epochs=args.epochs,
verbose=args.v,
workers=4,
initial_epoch=resume_from_epoch,
validation_data=val_data_generator,
validation_steps=val_step_size)
# Evaluate the model on the validation data set.
score = model_with_lovasz.evaluate_generator(val_data_generator,
val_step_size)
print('Test loss:', score[0])
print('Test accuracy:', score[1])
def train(
self,
layer_size,
num_samples,
train_size=0.7,
batch_size: int = 200,
num_epochs: int = 20,
learning_rate=5e-3,
dropout=0.0,
use_bias=True,
):
"""
Build and train the HinSAGE model for link attribute prediction on the specified graph G
with given parameters.
Args:
layer_size: a list of number of hidden nodes in each layer
num_samples: number of neighbours to sample at each layer
batch_size: size of mini batch
num_epochs: number of epochs to train the model (epoch = all training batches are streamed through the model once)
learning_rate: initial learning rate
dropout: dropout probability in the range [0, 1)
use_bias: tells whether to use a bias terms in HinSAGE model
Returns:
"""
# Training and test edges
edges = list(self.g.edges(data=True))
edges_train, edges_test = model_selection.train_test_split(
edges, train_size=train_size)
# Edgelists:
edgelist_train = [(e[0], e[1]) for e in edges_train]
edgelist_test = [(e[0], e[1]) for e in edges_test]
labels_train = [e[2]["score"] for e in edges_train]
labels_test = [e[2]["score"] for e in edges_test]
# Our machine learning task of learning user-movie ratings can be framed as a supervised Link Attribute Inference:
# given a graph of user-movie ratings, we train a model for rating prediction using the ratings edges_train,
# and evaluate it using the test ratings edges_test. The model also requires the user-movie graph structure.
# To proceed, we need to create a StellarGraph object from the ingested graph, for training the model:
# When sampling the GraphSAGE subgraphs, we want to treat user-movie links as undirected
self.g = sg.StellarGraph(self.g, node_features="feature")
# Next, we create the link generators for preparing and streaming training and testing data to the model.
# The mappers essentially sample k-hop subgraphs of G with randomly selected head nodes, as required by
# the HinSAGE algorithm, and generate minibatches of those samples to be fed to the input layer of the HinSAGE model.
generator = HinSAGELinkGenerator(
self.g,
batch_size,
num_samples,
)
train_gen = generator.flow(edgelist_train, labels_train)
test_gen = generator.flow(edgelist_test, labels_test)
# Build the model by stacking a two-layer HinSAGE model and a link regression layer on top.
assert len(layer_size) == len(
num_samples
), "layer_size and num_samples must be of the same length! Stopping."
hinsage = HinSAGE(layer_sizes=layer_size,
generator=train_gen,
bias=use_bias,
dropout=dropout)
# Define input and output sockets of hinsage:
x_inp, x_out = hinsage.default_model()
# Final estimator layer
score_prediction = link_regression(
edge_embedding_method=args.edge_embedding_method)(x_out)
# Create Keras model for training
model = Model(inputs=x_inp, outputs=score_prediction)
model.compile(
optimizer=optimizers.Adam(lr=learning_rate),
loss=losses.mean_squared_error,
metrics=[root_mean_square_error, metrics.mae],
)
# Train model
print("Training the model for {} epochs with initial learning rate {}".
format(num_epochs, learning_rate))
history = model.fit_generator(
train_gen,
validation_data=test_gen,
epochs=num_epochs,
verbose=2,
shuffle=True,
use_multiprocessing=True,
workers=multiprocessing.cpu_count() // 2,
)
# Evaluate and print metrics
test_metrics = model.evaluate_generator(test_gen)
print("Test Evaluation:")
for name, val in zip(model.metrics_names, test_metrics):
print("\t{}: {:0.4f}".format(name, val))
def three_streams_rgb():
dataset_train = '/home/cic/datasets/ImageNet/train/'
dataset_test = '/home/cic/datasets/ImageNet/validation/'
save_dir = '/home/nsallent/output/saved_models/'
model_name = 'three_streams_rgb'
input_size = 224
classes_train = []
for folder in listdir(dataset_train):
if folder in classes_values:
classes_train.append(folder)
classes_test = []
for folder in listdir(dataset_test):
if folder in classes_values:
classes_test.append(folder)
def color_transformation(image):
image = np.array(image)
pca_image = rgb2pca(image)
scalers = {}
for i in range(pca_image.shape[0]):
scalers[i] = MinMaxScaler((0, 255))
pca_image[i, :, :] = scalers[i].fit_transform(pca_image[i, :, :])
return Image.fromarray(pca_image.astype('uint8'))
train_datagen = ImageDataGenerator(
rescale=1. / 255,
shear_range=0.2,
zoom_range=0.2,
horizontal_flip=True,
preprocessing_function=color_transformation)
test_datagen = ImageDataGenerator(
rescale=1. / 255, preprocessing_function=color_transformation)
train_generator = train_datagen.flow_from_directory(
dataset_train,
target_size=(input_size, input_size),
classes=classes_train[:35])
validation_generator = test_datagen.flow_from_directory(
dataset_test,
target_size=(input_size, input_size),
classes=classes_test[:35])
output, im_input, input_shape = three_streams()
model = Model(inputs=im_input, outputs=output)
print(model.summary())
opt = optimizers.SGD(lr=0.01, decay=0.0005, momentum=0.9)
model.compile(optimizer=opt, loss='categorical_crossentropy')
model.fit_generator(train_generator,
steps_per_epoch=20,
epochs=50,
validation_steps=800,
validation_data=validation_generator)
# Save model and weights
if not isdir(save_dir):
makedirs(save_dir)
model_path = join(save_dir, model_name)
model.save(model_path)
print('Saved trained model at %s ' % model_path)
# Score trained model.
scores = model.evaluate_generator(validation_generator)
print('Test loss:', scores[0])
print('Test accuracy:', scores[1])
class AchillesModel:
def __init__(self, data_file=None, log_dir=""):
self.data_file = data_file
self.log_dir = log_dir
self.model = None
def build(
self,
window_size=400,
activation="softmax",
bidirectional=True,
nb_channels=256,
rnn_units=200,
_nb_classes=2,
nb_residual_block=1,
nb_rnn=1,
dropout=0.0,
gru=False,
gpus=1,
summary=True,
):
# Kernel size and strides are only used for single convolutional layers (1D, or 2D)
# Default for residual block or Conv2D:
shape = (1, window_size, 1)
# Input data shape for residual block (Conv2D)
inputs = layers.Input(shape=shape)
######################
# Residual Block CNN #
######################
# Residual block stack, see config
x = self.residual_block(inputs, nb_channels, input_shape=shape)
if nb_residual_block > 1:
for i in range(nb_residual_block - 1):
x = self.residual_block(x, nb_channels)
# Reshape the output layer of residual blocks from 4D to 3D
x = layers.Reshape((1 * window_size, nb_channels))(x)
######################
# Bidirectional RNN #
######################
if gru:
# GRU does not appear to be as good as LSTM!
rnn_layer = layers.GRU
else:
rnn_layer = layers.LSTM
# "recurrent_dropout": rc_dropout <-- this hits performance massively even if set to 0
dropout_params = {"dropout": dropout}
# Add two Bidirectional RNN layers where sequences returned,
# then into last layer with standard RNN output into Dense
if nb_rnn > 0:
# Deep bidirectional RNN layers must return sequences for stacking
if nb_rnn > 1:
for i in range(nb_rnn - 1):
# The following structure adds GRU or LSTM cells to the
# model, and depending on whether the net is
# trained / executed exclusively on GPU, standard cells
# are replaced by CuDNN variants, these do
# currently not support DROPOUT!
if bidirectional:
x = layers.Bidirectional(
rnn_layer(
rnn_units, return_sequences=True, **dropout_params
)
)(x)
else:
x = rnn_layer(
rnn_units, return_sequences=True, **dropout_params
)(x)
if bidirectional:
x = layers.Bidirectional(rnn_layer(rnn_units, **dropout_params))(x)
else:
x = rnn_layer(rnn_units, **dropout_params)(x)
else:
# If no RNN layers, flatten shape for Dense
x = layers.Flatten()(x)
outputs = layers.Dense(_nb_classes, activation=activation)(x)
self.model = Model(inputs=inputs, outputs=outputs)
if summary:
self.model.summary()
if gpus <= 1:
print("Built model for training on 1 GPU.")
return self.model
else:
print(f"Building model for distributed training on {gpus} GPUs.")
raise ValueError(
'Current version of Keras does not support multi GPU models.'
)
def save(self, run_id, file):
self.model.save(os.path.join(run_id, file))
def compile(self, optimizer="adam", loss="binary_crossentropy"):
self.model.compile(optimizer=optimizer, loss=loss, metrics=["accuracy"])
return self.model
def train(
self,
batch_size=15,
epochs=10,
workers=2,
run_id="run_1",
outdir="run_1",
verbose=True,
gpu=None,
):
if gpu:
print(f"CUDA_VISIBLE_DEVICES environment variable set to {gpu}")
os.environ["CUDA_VISIBLE_DEVICES"] = str(gpu)
# Estimated memory for dimensions and
# batch size of model, before adjustment:
# memory = self.estimate_memory_usage(batch_size=batch_size)
# print("Estimated GPU memory for AchillesModel model: {} GB".format(memory))
# Reads data from HDF5 data file:
dataset = AchillesDataset()
# Get training and validation data generators
training_generator = dataset.get_signal_generator(
self.data_file, data_type="training", batch_size=batch_size, shuffle=True
)
validation_generator = dataset.get_signal_generator(
self.data_file, data_type="validation", batch_size=batch_size, shuffle=True
)
# Make log directory:
if outdir:
os.makedirs(outdir, exist_ok=True)
else:
outdir = os.getcwd()
# Callbacks
csv = CSVLogger(os.path.join(outdir, run_id + ".epochs.log"))
chk = ModelCheckpoint(
os.path.join(outdir, run_id + ".checkpoint.val_loss.h5"),
monitor="val_loss",
verbose=0,
save_best_only=False,
save_weights_only=False,
mode="auto",
save_freq=1,
)
print(
f"Running on batch size {batch_size} for {epochs} epochs "
f"with {workers} worker processes --> run ID: {run_id}"
)
# TODO: Enable NCPU
history = self.model.fit(
training_generator,
use_multiprocessing=False,
workers=workers,
epochs=epochs,
validation_data=validation_generator,
callbacks=[csv, chk],
verbose=verbose,
)
with open(
os.path.join(outdir, "{}.model.history".format(run_id)), "wb"
) as history_out:
pickle.dump(history.history, history_out)
def adjust_batch_size(self, batch_size):
""" Function for adjusting batch size to live GPU memory; this is not an accurate estimation
but rather aims at conservatively estimating available GPU memory and adjusting the batch size
so that training does not raise out-of-memory errors, particularly when using training as part
of Nextflow workflows where the underlying data dimensions (and therefore memory occupancy) may
differ between runs or across a grid search.
"""
# TODO
mem = self.estimate_memory_usage(batch_size)
def load_model(self, model_file, summary=True):
""" Load model from HDF5 output file with model layers and weights """
# Read model stats
self.model = load_model(model_file)
if summary:
self.model.summary()
def evaluate(self, eval_generator, workers=2):
""" Evaluate model against presented dataset """
loss, acc = self.model.evaluate_generator(
eval_generator, workers=workers, verbose=True,
use_multiprocessing=False
)
return loss, acc
@timeit(micro=True)
def predict(
self, signal_tensor: np.array = None, batch_size=10,
null_pass: np.shape = None
):
""" Predict signal arrays using model test function,
might implement in class later"""
# Read Fast5 and extract windows from signal array:
if null_pass:
# Warmup pass to allocate memory
signal_tensor = np.zeros(shape=null_pass)
# Select random or beginning consecutive windows
return self.model.predict(x=signal_tensor, batch_size=batch_size)
def predict_generator(self, data_type="data", batch_size=1000):
# Reads data from HDF5 data file:
dataset = AchillesDataset()
# Get training and validation data generators
prediction_generator = dataset.get_signal_generator(
self.data_file,
data_type=data_type,
batch_size=batch_size,
shuffle=False,
no_labels=True,
)
return self.model.predict_generator(prediction_generator)
@staticmethod
def residual_block(
y,
nb_channels,
input_shape=None,
_strides=(1, 1),
_project_shortcut=True,
_leaky=False,
):
""" Residual block adapted from https://gist.github.com/mjdietzx/5319e42637ed7ef095d430cb5c5e8c64
Added one more convolution filter and changed kernel sizes to those described in Chiron.
Also set _project_shortcut to default True for activating condition for sum of shortcut and layers, see Chiron.
"""
shortcut = y
# Stack 1
if input_shape:
y = layers.Conv2D(
nb_channels,
input_shape=input_shape,
kernel_size=(1, 1),
strides=_strides,
padding="same",
)(y)
else:
y = layers.Conv2D(
nb_channels, kernel_size=(1, 1), strides=_strides, padding="same"
)(y)
y = layers.BatchNormalization()(y)
if _leaky:
y = layers.LeakyReLU()(y)
else:
y = layers.Activation("relu")(y)
# Stack 2
y = layers.Conv2D(
nb_channels, kernel_size=(1, 3), strides=(1, 1), padding="same"
)(y)
y = layers.BatchNormalization()(y)
if _leaky:
y = layers.LeakyReLU()(y)
else:
y = layers.Activation("relu")(y)
# Stack 3
y = layers.Conv2D(
nb_channels, kernel_size=(1, 1), strides=(1, 1), padding="same"
)(y)
y = layers.BatchNormalization()(y)
# ... with shortcut for concatenation before ReLU
# nb: identity shortcuts used directly when the input
# and output are of the same dimensions
if _project_shortcut or _strides != (1, 1):
shortcut = layers.Conv2D(
nb_channels, kernel_size=(1, 1), strides=_strides, padding="same"
)(shortcut)
shortcut = layers.BatchNormalization()(shortcut)
y = layers.add([shortcut, y])
if _leaky:
y = layers.LeakyReLU()(y)
else:
y = layers.Activation("relu")(y)
return y
def estimate_memory_usage(self, batch_size):
""" https://stackoverflow.com/a/46216013 """
shapes_mem_count = 0
for l in self.model.layers:
single_layer_mem = 1
for s in l.output_shape:
if s is None:
continue
single_layer_mem *= s
shapes_mem_count += single_layer_mem
trainable_count = np.sum(
[K.count_params(p) for p in set(self.model.trainable_weights)]
)
non_trainable_count = np.sum(
[K.count_params(p) for p in set(self.model.non_trainable_weights)]
)
total_memory = (
4.0
* batch_size
* (shapes_mem_count + trainable_count + non_trainable_count)
)
gbytes = np.round(total_memory / (1024.0 ** 3), 3)
return gbytes
def testModel(m:k.Model, genTst:DirectoryIterator) -> np.ndarray: metrics = m.evaluate_generator(genTst, use_multiprocessing=False, workers=1) return metrics
# np.save(open('models/bottleneck_features_validation.npy', 'wb'), bottleneck_features_validation)
#
filepath = "model/finetuning-weights-improvement-{epoch:02d}-{val_acc:.3f}.h5"
# 每次epoch之后，如果验证误差减少，则保存模型数据
checkpoint = ModelCheckpoint(filepath,
monitor='val_acc',
verbose=2,
save_best_only=True,
mode='max')
callbacks_list = [checkpoint]
model.fit_generator(train_generator,
steps_per_epoch=nb_train_samples // batch_size,
epochs=epochs,
validation_data=validation_generator,
validation_steps=nb_validation_samples // batch_size,
callbacks=callbacks_list)
model.evaluate_generator(validation_generator, nb_validation_samples)
# 同时保存model和权重
# model.save('first_model.h5')
# 保存model
# model_json = model.to_json()
# with open("model.json", "w") as json_file:
# json_file.write(model_json)
# 载入model ,读取json文件
# json_string = open('model.json').read()
# model = model_from_json(json_string)
class Cnn8(object):
def __init__(self, pid, params):
self.img_width, self.img_height = params['image_width'], params[
'image_height']
self.id = pid
print("Using cnn8 classifier with id ", str(self.id))
self.train_dir = params['train_dir']
self.validation_dir = params['validation_dir']
self.test_dir = params['test_dir']
self.cnn_dir = paths.ROOT_DIR + '/model/' + self.id + '/'
self.batch_size = params['batch_size']
self.learning_rate = params['learning_rate']
self.epochs = params['epochs']
self.workers = params['workers']
self.fine_tune_from = params['fine_tune_from']
self.train_generator, self.validation_generator, self.test_generator = None, None, None
self.transfer_train_time = params['transfer_train_params'][
'train_time']
self.tt_acc = params['transfer_train_params']['accuracy']
self.tt_loss = params['transfer_train_params']['loss']
self.fine_tune_time = params['fine_tune_params']['train_time']
self.ft_acc = params['fine_tune_params']['accuracy']
self.ft_loss = params['fine_tune_params']['loss']
# TODO test params
def prepare(self):
print("Setting up CNN v8..")
if not os.path.exists(self.cnn_dir):
os.makedirs(self.cnn_dir)
ImageFile.LOAD_TRUNCATED_IMAGES = True
# Rescale all images by 1./255 and apply image augmentation
train_datagen = ImageDataGenerator(shear_range=0.2,
zoom_range=0.2,
rotation_range=20,
width_shift_range=0.2,
height_shift_range=0.2,
rescale=1. / 255)
validation_datagen = ImageDataGenerator(rescale=1. / 255)
test_datagen = ImageDataGenerator(rescale=1. / 255)
self.train_generator = train_datagen.flow_from_directory(
self.train_dir,
target_size=(self.img_width, self.img_height),
batch_size=self.batch_size,
class_mode='categorical')
self.validation_generator = validation_datagen.flow_from_directory(
self.validation_dir,
target_size=(self.img_width, self.img_height),
batch_size=self.batch_size,
class_mode='categorical')
self.test_generator = test_datagen.flow_from_directory(
self.test_dir,
target_size=(self.img_width, self.img_height),
batch_size=self.batch_size,
class_mode='categorical')
print("Generators are ready, saving class indices")
np.save((self.cnn_dir + "class_indices.npy"),
self.train_generator.class_indices)
self.IMG_SHAPE = (self.img_width, self.img_height, 3)
self.num_classes = len(self.train_generator.class_indices)
print("Creating transfer train model")
# Create the base model from the pre-trained model MobileNet V2 on imagenet data
self.base_model = MobileNetV2(input_shape=self.IMG_SHAPE,
include_top=False,
weights='imagenet')
# its already trained, we just use the features
self.base_model.trainable = False
top_model = Sequential()
top_model.add(GlobalAveragePooling2D())
top_model.add(
Dense(128, activation='relu', kernel_regularizer=l2(0.01)))
top_model.add(Dropout(0.5))
top_model.add(Dense(64, activation='relu',
kernel_regularizer=l2(0.01)))
top_model.add(Dropout(0.5))
top_model.add(Dense(64, activation='relu',
kernel_regularizer=l2(0.01)))
top_model.add(Dropout(0.5))
top_model.add(
Dense(self.num_classes,
activation='softmax',
kernel_regularizer=l2(0.01)))
self.model = Model(input=self.base_model.input,
output=top_model(self.base_model.output))
self.model.compile(optimizer=RMSprop(lr=self.learning_rate),
loss='categorical_crossentropy',
metrics=['accuracy'])
print("Model created for id %s" % self.id)
self.steps_per_epoch = self.train_generator.n // self.batch_size
self.validation_steps = self.validation_generator.n // self.batch_size
self.test_steps = self.test_generator.n // self.batch_size
print("Initializing callbacks")
self.callbacks = [
EarlyStopping(monitor='val_loss',
min_delta=0,
patience=3,
verbose=0,
mode='auto'),
ModelCheckpoint(filepath=(self.cnn_dir + "model-weights.h5"),
verbose=1,
save_best_only=True),
History(),
TensorBoard(log_dir="logs/{}".format(self.id))
]
try:
self.model.load_weights((self.cnn_dir + "model-weights.h5"))
print("Found weights for %s, loading them and continue training" %
self.id)
except OSError:
pass
print("Cnn is ready for train")
def transfer_train(self):
start_time = time.time()
print("Transfer training started")
self.history = self.model.fit_generator(
self.train_generator,
steps_per_epoch=self.steps_per_epoch,
epochs=self.epochs,
workers=self.workers,
callbacks=self.callbacks,
validation_data=self.validation_generator,
validation_steps=self.validation_steps)
self.tt_loss, self.tt_acc = self.model.evaluate_generator(
self.test_generator, self.test_steps)
self.transfer_train_time += time.time() - start_time
print("Transfer train ended at: %d sec" % self.transfer_train_time)
self.model.save(self.cnn_dir + 'model.h5')
self.acc = self.history.history['accuracy']
self.val_acc = self.history.history['val_accuracy']
self.loss = self.history.history['loss']
self.val_loss = self.history.history['val_loss']
self.create_plot('transfer_train', self.acc, self.val_acc, self.loss,
self.val_loss)
return {
'train_time': self.transfer_train_time,
'accuracy': self.tt_acc,
'loss': self.tt_loss
}
def create_plot(self, name, acc, val_acc, loss, val_loss):
plt.figure(figsize=(8, 8))
plt.subplot(2, 1, 1)
plt.plot(acc, label='Training Accuracy')
plt.plot(val_acc, label='Validation Accuracy')
plt.legend(loc='lower right')
plt.ylabel('Accuracy')
plt.ylim([min(plt.ylim()), 1])
plt.title('Training and Validation Accuracy')
plt.subplot(2, 1, 2)
plt.plot(loss, label='Training Loss')
plt.plot(val_loss, label='Validation Loss')
plt.legend(loc='upper right')
plt.ylabel('Cross Entropy')
plt.ylim([0, max(plt.ylim())])
plt.title('Training and Validation Loss')
plt.savefig(self.cnn_dir + name + ".png")
plt.close()
def fine_tune(self):
start_time = time.time()
print("Fine tune started")
self.base_model.trainable = True
# Let's take a look to see how many layers are in the base model
print("Unfreezing %d layer from %d: " %
(self.fine_tune_from, len(self.base_model.layers)))
# Freeze all the layers before the `fine_tune_from` layer
for layer in self.base_model.layers[:self.fine_tune_from]:
layer.trainable = False
# Recompile model
self.model.compile(loss='categorical_crossentropy',
optimizer=RMSprop(lr=2e-5),
metrics=['accuracy'])
history_fine = self.model.fit_generator(
self.train_generator,
steps_per_epoch=self.steps_per_epoch,
epochs=self.epochs,
callbacks=self.callbacks,
workers=4,
validation_data=self.validation_generator,
validation_steps=self.validation_steps)
self.ft_loss, self.ft_acc = self.model.evaluate_generator(
self.test_generator, self.test_steps)
self.model.save(self.cnn_dir + 'model.h5')
self.fine_tune_time += time.time() - start_time
print("Fine tuning model ended %d" % self.fine_tune_time)
self.acc += history_fine.history['accuracy']
self.val_acc += history_fine.history['val_accuracy']
self.loss += history_fine.history['loss']
self.val_loss += history_fine.history['val_loss']
self.create_plot('fine_tune', self.acc, self.val_acc, self.loss,
self.val_loss)
return {
'train_time': self.fine_tune_time,
'accuracy': self.ft_acc,
'loss': self.ft_loss
}
def test(self):
start_time = time.time()
print("Test started")
class RetrainedClassificationModel(TrainableModel):
def __init__(self, name, img_width=224, img_height=224):
super().__init__(name)
self.img_width = img_width
self.img_height = img_height
self.model = None
self.reset()
def reset(self):
model = keras.applications.VGG16(weights="imagenet",
include_top=False,
input_shape=(self.img_width,
self.img_height, 3))
model.layers.pop()
# Adding custom Layers
x = model.layers[-1].output
x = Reshape((self.img_width, self.img_height, 2))(x)
x = Conv2D(1, 1, activation='sigmoid')(x)
predictions = Flatten()(x)
# Creating the final model
self.model = Model(input=model.input, output=predictions)
def train(self,
batch_size: int,
l2_regularization: float = 0,
dropout_drop_porb: float = 0,
n_epoch: int = 3,
reduced_size=None,
remove_nan=True):
label_converter = lambda x: cv2.resize(x, (self.img_width, self.
img_height))
image_converter = self._input_converter
image_converter_eval = lambda x: keras.applications.vgg16.preprocess_input(
label_converter(x))
training, _, _ = getABSDDataMask(batch_size,
label_converter=label_converter,
image_converter=image_converter,
reduced_size=reduced_size,
remove_nan=remove_nan)
_, dev, _ = getABSDDataMask(batch_size,
label_converter=label_converter,
image_converter=image_converter_eval,
reduced_size=reduced_size,
remove_nan=remove_nan)
callbacks = [
TensorBoard(write_images=True),
ModelCheckpoint('tcm.{epoch:02d}.hdf5',
monitor='val_f1',
save_best_only=True,
mode='max'),
EarlyStopping(monitor='val_loss', patience=10)
]
for layer in self.model.layers:
if hasattr(layer, 'kernel_regularizer'):
layer.kernel_regularizer = l2(l2_regularization)
if isinstance(layer, Dropout):
layer.rate = dropout_drop_porb
self.model.compile(loss="binary_crossentropy",
optimizer='adagrad',
metrics=[precision, recall, f1])
hst = self.model.fit_generator(training,
validation_data=dev,
callbacks=callbacks,
epochs=n_epoch)
self.model.save("tcm.hd5")
return hst
def eval(self, batch_size: int, reduced_size=None, remove_nan=True):
label_converter = lambda x: cv2.resize(x, (self.img_width, self.
img_height))
image_converter = lambda x: keras.applications.vgg16.preprocess_input(
label_converter(x))
training, dev, _ = getABSDDataMask(batch_size,
label_converter=label_converter,
image_converter=image_converter,
reduced_size=reduced_size,
remove_nan=remove_nan)
return self.model.evaluate_generator(dev, verbose=1)
def _input_converter(self, x):
resized = cv2.resize(x, (self.img_width, self.img_height))
noise = np.random.normal(0, 5, size=resized.shape)
img = np.clip(resized + noise, 0, 255)
return keras.applications.vgg16.preprocess_input(img)
loss='categorical_crossentropy',
metrics=['accuracy'])
datagen_train = ImageDataGenerator(rotation_range=20,
horizontal_flip=True,
vertical_flip=True,
validation_split=0.2,
width_shift_range=0.2,
height_shift_range=0.2)
#datagen_train = ImageDataGenerator()
datagen_train = datagen_train.flow_from_directory('../train',
target_size=(124, 124),
shuffle=True,
batch_size=32)
datagen_test = ImageDataGenerator()
datagen_test = datagen_test.flow_from_directory('../test',
target_size=(124, 124),
shuffle=True,
batch_size=32)
hist = model.fit_generator(datagen_train,
steps_per_epoch=158,
epochs=250,
callbacks=[tb])
loss, acc = model.evaluate_generator(datagen_test, steps=10, verbose=0)
print('loss = ', loss, 'acc = ', acc)
model.save('./vggtransfer_VGG.h5')
def main():
'Main'
from argparse import ArgumentParser
import os
# available architectures
models_list = [
'vgg16',
'vgg19',
'inceptionv3',
'resnet50',
'custom',
'xception',
'inceptionresnet',
'mobilenet',
'densenet121',
'densenet169',
'densenet201',
'nasnet',
'mobilenetv2'
]
# available optimizers
optimizers_list = ['sgd', 'adam']
losses_list = [
'categorical_crossentropy',
'sparse_categorical_crossentropy',
'binary_crossentropy',
'mean_squared_error',
'mean_absolute_error',
'mean_absolute_percentage_error',
'mean_squared_logarithmic_error',
'squared_hinge',
'hinge',
'categorical_hinge',
'logcosh',
'kullback_leibler_divergence',
'poisson',
'cosine_proximity'
]
# print these names for loss functions
losses_dict = {
'mean_squared_error': 'MSE',
'mean_absolute_error': 'MAE',
'mean_absolute_percentage_error': 'MAPE',
'mean_squared_logarithmic_error': 'MSLE',
'squared_hinge': 'Squared Hinge',
'hinge': 'Hinge',
'categorical_hinge': 'Categorical Hinge',
'logcosh': 'Log-Cosh',
'categorical_crossentropy': 'Categorial Cross-entropy',
'sparse_categorical_crossentropy': 'Sparse Categorical Cross-entropy',
'binary_crossentropy': 'Binary Cross-entropy',
'kullback_leibler_divergence': 'Kullback-Leibler Divergence',
'poisson': 'Poisson',
'cosine_proximity': 'Cosine Proximity'
}
parser = ArgumentParser()
parser.add_argument('model', help='which model to use',
type=str, choices=models_list)
parser.add_argument('path', help='path to data', type=str)
parser.add_argument('--loadfrom', help='load previous model', type=str)
parser.add_argument(
'-e', '--epochs', help='epochs to train for', type=int, default=30)
parser.add_argument(
'-b', '--batch', help='training batch size', type=int, default=8)
parser.add_argument('-o', '--optimizer', help='optimizer to use',
type=str, choices=optimizers_list, default='sgd')
parser.add_argument(
'-s', '--split', help='test split size', default=0.2, type=float)
parser.add_argument('-t', '--testset', help='path to test data', type=str)
parser.add_argument('--loss', help='loss function to use', type=str,
choices=losses_list, default='categorical_crossentropy')
parser.add_argument('--nogpu', help='disable GPU',
action='store_true', dest='no_gpu')
parser.add_argument('--usemp', help='enable multiprocessing for sequences',
action='store_true', dest='use_mp')
parser.add_argument(
'--pretrained', help='load pre-trained weights', action='store_true')
parser.add_argument('--output', help='output file', type=str)
parser.add_argument('--extsum', help='print extended summary',
action='store_true', dest='print_extsum')
parser.add_argument('--sum', help='print summary',
action='store_true', dest='print_sum')
parser.add_argument('--json', help='save model as JSON file', type=str)
parser.add_argument('--log', help='test log filename',
type=str, default='tests_log.log')
parser.add_argument(
'--shape', help='input shape in (height:width:depth) format', type=str)
parser.add_argument(
'--dropout', help='dropout probability (default=0)', type=float)
parser.add_argument('--pfldir', help='put .pfl files here',
type=str, default='.', dest='pfldir')
parser.add_argument('--decay', help='weight decay',
default=0.005, type=float, dest='weight_decay')
parser.add_argument('-K', help='apply kernel regularization',
action='store_true', dest='regularize_kernel')
parser.add_argument('-B', help='apply bias regularization',
action='store_true', dest='regularize_bias')
parser.add_argument('-A', help='apply activity regularization',
action='store_true', dest='regularize_activity')
parser.add_argument(
'-a', '--augment', help='apply perform data augmentation', action='store_true')
parser.add_argument(
'--seed', help='random seed for train-test split', type=int, default=7)
args = parser.parse_args()
from keras.callbacks import Callback
if args.pfldir:
os.makedirs(args.pfldir, exist_ok=True)
if args.output:
os.makedirs(args.output, exist_ok=True)
class PerformanceHistory(Callback):
def __init__(self, output_file: str):
super().__init__()
self.output_file = open(output_file, 'wt')
self.csv_file = csv.writer(self.output_file)
self.csv_file.writerow(
['ACCURACY', 'LOSS', 'VALIDATION ACCURACY', 'VALIDATION LOSS'])
def on_epoch_end(self, batch, logs={}):
self.csv_file.writerow([logs.get('accuracy'), logs.get(
'loss'), logs.get('val_accuracy'), logs.get('val_loss')])
self.output_file.flush()
def __del__(self):
self.output_file.close()
if args.no_gpu:
os.environ['CUDA_DEVICE_ORDER'] = 'PCI_BUS_ID'
os.environ['CUDA_VISIBLE_DEVICES'] = ''
image_dim = 224 if args.model in ['vgg16', 'vgg19', 'custom'] else 299
input_shape = (image_dim, image_dim, 3)
if args.shape is not None:
input_shape = [(int(y) if y != '' else 1)
for y in args.shape.split(':')]
import keras.applications as apps
# preprocessing functions dictonary
input_preprocessing = {
'vgg16': apps.vgg16.preprocess_input,
'vgg19': apps.vgg19.preprocess_input,
'inceptionv3': apps.inception_v3.preprocess_input,
'resnet50': apps.resnet50.preprocess_input,
'custom': apps.vgg16.preprocess_input,
'xception': apps.xception.preprocess_input,
'inceptionresnet': apps.inception_resnet_v2.preprocess_input,
'mobilenet': apps.mobilenet.preprocess_input,
'densenet121': apps.densenet.preprocess_input,
'densenet169': apps.densenet.preprocess_input,
'densenet201': apps.densenet.preprocess_input,
'nasnet': apps.nasnet.preprocess_input,
'mobilenetv2': apps.mobilenet_v2.preprocess_input
}
from keras.layers import Dropout
from keras.regularizers import l2
from keras.models import load_model
from keras import Model
from optimizers import getOptimizer
from sklearn.model_selection import train_test_split
from sklearn.preprocessing import LabelBinarizer
from generator import AugmentedBatchGenerator, BatchGenerator
from extsum import extended_summary
import numpy as np
import datetime as dt
import pickle
import csv
import subprocess
from random import shuffle, seed
# load default specified dataset
data_path = os.path.abspath(args.path)
X_raw = []
y_raw = []
for d in os.listdir(data_path):
for f in os.listdir(data_path + '/' + d):
X_raw.append('/'.join([data_path, d, f]))
y_raw.append(d)
lb = LabelBinarizer()
lb.fit(y_raw)
seed(args.seed)
if args.testset:
# if a test set was specified, load it
print(f'Using data at {args.testset} as test set.')
# shuffle training data
training_shuffled = list(zip(X_raw, y_raw))
shuffle(training_shuffled)
X_data, y_data = zip(*training_shuffled)
X_data, y_data = np.asarray(X_data), lb.transform(y_data)
X_train, y_train = X_data, y_data
data_path = os.path.abspath(args.testset)
X_raw = []
y_raw = []
for d in os.listdir(data_path):
for f in os.listdir(data_path + '/' + d):
X_raw.append('/'.join([data_path, d, f]))
y_raw.append(d)
# shuffle test
test_shuffled = list(zip(X_raw, y_raw))
shuffle(test_shuffled)
X_raw, y_raw = zip(*test_shuffled)
X_test, y_test = np.asarray(X_raw), lb.transform(y_raw)
else:
# otherwise split default dataset
print(f'Using {args.split} of the provided dataset as test set.')
X_data, y_data = np.asarray(X_raw), lb.transform(y_raw)
X_train, X_test, y_train, y_test = train_test_split(
X_data, y_data, test_size=args.split, random_state=args.seed)
del X_raw
del y_raw
n_classes = y_data.shape[1]
models_dict = {
'xception': apps.Xception,
'vgg16': apps.VGG16,
'vgg19': apps.VGG19,
'resnet50': apps.ResNet50,
'inceptionv3': apps.InceptionV3,
'inceptionresnet': apps.InceptionResNetV2,
'mobilenet': apps.MobileNet,
'mobilenetv2': apps.MobileNetV2,
'densenet121': apps.DenseNet121,
'densenet169': apps.DenseNet169,
'densenet201': apps.DenseNet201,
'nasnet': apps.NASNetLarge
}
# load vanilla model with specified parameters
model = models_dict[args.model](
classes=n_classes, input_shape=input_shape, weights='imagenet' if args.pretrained else None)
if args.dropout is not None:
print('Adding weight decay')
# insert dropout layer and regularization
preds = model.layers[-1]
dp = Dropout(args.dropout)(model.layers[-2].output)
preds = preds(dp)
model = Model(inputs=model.inputs, outputs=preds)
for layer in model.layers:
if args.regularize_kernel:
layer.kernel_regularizer = l2(args.weight_decay)
if args.regularize_bias:
layer.bias_regularizer = l2(args.weight_decay)
if args.regularize_activity:
layer.activity_regularizer = l2(args.weight_decay)
opt = getOptimizer(args.optimizer)
model.compile(loss=args.loss, optimizer=opt, metrics=['accuracy'])
if args.loadfrom:
print('Loading', args.loadfrom)
model = load_model(os.path.abspath(args.loadfrom))
# iteratively rename performance file
pfldir = os.path.abspath(args.pfldir)
performance_file = os.path.join(
pfldir, f'{args.model}_b{args.batch}_e{args.epochs}.pfl')
fnum = 1
while os.path.isfile(performance_file):
performance_file = os.path.join(
pfldir, f'{args.model}_b{args.batch}_e{args.epochs}_{fnum}.pfl')
fnum += 1
os.makedirs(pfldir, exist_ok=True)
if args.print_extsum:
extended_summary(model)
elif args.print_sum:
model.summary()
perf_log = PerformanceHistory(performance_file)
# print test parameters to screen
print('\n{:<20}{}'.format('Model', args.model))
print('{:<20}{}'.format('Input shape', input_shape))
print('{:<20}{}'.format('Epochs', args.epochs))
print('{:<20}{}'.format('Batch size', args.batch))
print('{:<20}{}'.format('Optimizer', type(opt).__name__))
print('{:<20}{}'.format('Optimizer params',
paramDictFormat(opt.get_config())))
print('{:<20}{}'.format('Loss', args.loss))
print('{:<20}{}'.format('Multiprocessing', 'On' if args.use_mp else 'Off'))
print('{:<20}{}'.format('Performance log', performance_file))
print('{:<20}{}'.format('Test log', args.log))
print('{:<20}{}'.format('Dataset', args.path))
reg = []
if args.regularize_kernel:
reg.append('kernel')
if args.regularize_activity:
reg.append('activity')
if args.regularize_bias:
reg.append('bias')
print('{:<20}{}\n'.format('Regularization',
'None' if not reg else ', '.join(reg)))
opt = getOptimizer(args.optimizer)
model.compile(loss=args.loss, optimizer=opt, metrics=['accuracy'])
# create training batch generator
if args.augment:
print('Data augmentation enabled.')
train_gen = AugmentedBatchGenerator(X_train, y_train, args.batch, shape=input_shape, ops=[
input_preprocessing[args.model]], pad=False)
else:
print('Data augmentation disabled.')
train_gen = BatchGenerator(X_train, y_train, args.batch, shape=input_shape, ops=[
input_preprocessing[args.model]], pad=False)
# create testing batch generator
test_gen = BatchGenerator(X_test, y_test, args.batch, shape=input_shape, ops=[
input_preprocessing[args.model]], pad=False)
# train model
train_start = dt.datetime.now()
model.fit_generator(train_gen, epochs=args.epochs, use_multiprocessing=args.use_mp,
validation_data=test_gen, callbacks=[perf_log])
train_end = dt.datetime.now()
# evaluate final model on train set
train_score = model.evaluate_generator(train_gen)
print('Train loss:', train_score[0])
print('Train accuracy:', train_score[1])
# evaluate final model on test set
test_score = model.evaluate_generator(test_gen)
print('Test loss:', test_score[0])
print('Test accuracy:', test_score[1])
# update tests log with current test data
date_format = '{:%Y-%m-%d %H:%M}'
log_format = '{:<20}{:<20}{:<20}{:<10}{:<10}{:<15}{:<15.5}{:<15.5}{:<15.5}{:<15.5}{:<30}{:<30}{:<70}{:<15}{:<15}{:<15}{:<15.5}{:<15.5}\n'
header_format = '{:<20}{:<20}{:<20}{:<10}{:<10}{:<15}{:<15}{:<15}{:<15}{:<15}{:<30}{:<30}{:<70}{:<15}{:<15}{:<15}{:<15}{:<15}\n'
with open(args.log, 'a+t') as test_log:
if test_log.tell() <= 0:
test_log.write(header_format.format(
'BEGIN', 'END', 'ARCHITECTURE', 'BATCH', 'EPOCHS', 'OPTIMIZER', 'TRAIN LOSS', 'TRAIN ACC', 'TEST LOSS', 'TEST ACC', 'DATA FOLDER', 'LOSS FUNCTION', 'OPTIMIZER PARAMS',
'KERNEL REG', 'BIAS REG', 'ACTIV. REG', 'DECAY', 'DROPOUT'))
start_str = date_format.format(train_start)
end_str = date_format.format(train_end)
data_folder = args.path.split('/')[-1 if args.path[-1] != '/' else -2]
test_log.write(log_format.format(start_str, end_str, args.model.upper(), args.batch, args.epochs, args.optimizer.upper(), train_score[0], train_score[1],
test_score[0], test_score[1], data_folder, losses_dict[args.loss], paramDictFormat(
opt.get_config()),
'YES' if args.regularize_kernel else 'NO',
'YES' if args.regularize_bias else 'NO',
'YES' if args.regularize_activity else 'NO',
args.weight_decay,
args.dropout if args.dropout else 0.0))
# save the model and class file if an output filename was specified
if args.output is not None:
print(f'Saving model as {args.output}.h5')
os.makedirs('/'.join(args.output.split('/')[:-1]), exist_ok=True)
model.save(f'{args.output}.h5')
with open(f'{args.output}.bin', 'wb') as fout:
pickle.dump((args.model, lb), fout)
subprocess.run(['notify-send', 'Entrenamiento completado',
f'Se ha completado el entrenamiento del modelo {args.model}.'], check=False)
class Cnn7(object):
def __init__(self, pid, core_params, classification_params, in_params,
out_params):
self.img_width, self.img_height = classification_params[
'image_width'], classification_params['image_height']
self.id = pid
print("Using cnn7 classifier with id ", str(self.id))
self.train_dir = core_params['train_dir']
self.test_dir = core_params['test_dir']
self.epochs = in_params['epochs']
self.batch_size = in_params['batch_size']
self.augmentation = in_params['augmentation']
self.num_classes = in_params['num_classes']
self.frozen_layers = in_params['frozen_layers']
self.learning_rate = in_params['learning_rate']
# self.momentum = in_params['momentum']
# self.top_model = in_params['top_model']
self.top_model = Sequential()
# model.add(Convolution2D(512, 3, 3, input_shape=(4, 4, 512), activation='relu'))
# model.add(Dropout(0.1))
# model.add(MaxPooling2D(pool_size=(2, 2)))
self.top_model.add(Flatten(input_shape=(4, 4, 512)))
self.top_model.add(Dense(512, activation='relu'))
self.top_model.add(Dropout(0.1))
self.top_model.add(Dense(256, activation='relu'))
self.top_model.add(Dropout(0.1))
self.top_model.add(
Dense(self.num_classes,
activation='softmax',
kernel_regularizer=regularizers.l2(0.001)))
self.top_model_weights_path = in_params['top_model_weights']
self.model_path = in_params['model']
self.model = None
self.history = None
self.out_params = out_params
def fine_tune(self):
self.base_model = applications.VGG19(weights='imagenet',
include_top=False,
input_shape=(self.img_width,
self.img_height, 3))
print('Base model loaded.')
self.top_model.load_weights(self.top_model_weights_path)
print("Top model weights loaded")
self.model = Model(input=self.base_model.input,
output=self.top_model(self.base_model.output))
for layer in self.model.layers[:self.frozen_layers]:
layer.trainable = False
print("%d layer unfreezed, %d freezed" %
(self.frozen_layers,
(len(self.model.layers) - self.frozen_layers)))
print("Compiling model")
self.model.compile(optimizer=optimizers.SGD(lr=self.learning_rate,
momentum=0.5),
loss='categorical_crossentropy',
metrics=['accuracy'])
# train_datagen = ImageDataGenerator(self.augmentation)
train_datagen = ImageDataGenerator(
# rotation_range= 30,
# width_shift_range= 0.2,
# height_shift_range= 0.2,
# fill_mode= 'nearest',
shear_range=0.2,
zoom_range=0.2,
horizontal_flip=True,
rescale=1. / 255)
test_datagen = ImageDataGenerator(rescale=1. / 255)
train_generator = train_datagen.flow_from_directory(
self.train_dir,
target_size=(self.img_height, self.img_width),
batch_size=self.batch_size,
class_mode='categorical')
nb_train_samples = len(train_generator.filenames)
validation_generator = test_datagen.flow_from_directory(
self.test_dir,
target_size=(self.img_height, self.img_width),
batch_size=self.batch_size,
class_mode='categorical')
nb_validation_samples = len(validation_generator.filenames)
self.checkpointer = ModelCheckpoint(
filepath=self.top_model_weights_path,
verbose=1,
save_best_only=True)
self.history = History()
callbacks = [
EarlyStopping(monitor='val_loss',
min_delta=0,
patience=5,
verbose=0,
mode='auto'), self.history, self.checkpointer
]
try:
self.history = self.model.fit_generator(
train_generator,
samples_per_epoch=nb_train_samples // self.batch_size,
epochs=self.epochs,
callbacks=callbacks,
validation_data=validation_generator,
nb_val_samples=nb_validation_samples // self.batch_size)
except KeyboardInterrupt:
print("Training stopped..")
self.model.save(self.model_path)
score = self.model.evaluate_generator(
validation_generator, nb_validation_samples // self.batch_size)
self.out_params['loss'] = score[0]
self.out_params['accuracy'] = score[1]
print("Training model ended, model saved")
def evaluate(self):
print("Evaluation fine tuned model")
plt.figure(2)
plt.subplot(211)
plt.plot(self.history.history['acc'])
plt.plot(self.history.history['val_acc'])
plt.title('model accuracy')
plt.ylabel('accuracy')
plt.xlabel('epoch')
plt.legend(['train', 'test'], loc='upper left')
plt.subplot(212)
plt.plot(self.history.history['loss'])
plt.plot(self.history.history['val_loss'])
plt.title('model loss')
plt.ylabel('loss')
plt.xlabel('epoch')
plt.legend(['train', 'test'], loc='upper left')
stat_plot_dir = paths.STAT_DIR + "/fine_" + str(self.id) + "_" + str(
time.time()) + ".png"
plt.savefig(stat_plot_dir)
self.out_params['plot'] = stat_plot_dir
self.out_params['history'] = self.history.history
with open(
paths.STAT_DIR + str(self.id) + "_" + str(time.time()) +
'.json', 'w') as outfile:
json.dump(self.history.history, outfile, indent=4)