import os
import pathlib
import shutil
import random
import tensorflow as tf
#%%
tf.logging.set_verbosity(tf.logging.INFO)
os.environ["CUDA_VISIBLE_DEVICES"] = '0' #use GPU with ID=0
config = tf.ConfigProto()
config.gpu_options.per_process_gpu_memory_fraction = 0.5 # maximun alloc gpu50% of MEM
config.gpu_options.allow_growth = True #allocate dynamically
sess = tf.Session(config = config)
def organize_datasets(src_train_path, dest_train_path, n= 25000, ratio=0.2):
src_path = pathlib.Path(src_train_path)
# get all jpg files in this src_path path
files = list(src_path.glob('*.jpg'))
random.shuffle(files)
files = files[:n]
n = int(len(files) * ratio)
val, train = files[:n], files[n:]
# remove old training folders
shutil.rmtree(dest_train_path, True)
print('{} removed'.format(dest_train_path))
# create new training folders
for c in ['dogs', 'cats']:
os.makedirs('{}/train/{}/'.format(dest_train_path, c))
os.makedirs('{}/validation/{}/'.format(dest_train_path, c))
print('folders created !')
# determine the picture's name is cat or dog
for t in train:
if 'cat' in t.name:
shutil.copy2(t, os.path.join(dest_train_path, 'train', 'cats'))
else:
shutil.copy2(t, os.path.join(dest_train_path, 'train', 'dogs'))
for v in val:
if 'cat' in v.name:
shutil.copy2(v, os.path.join(dest_train_path, 'validation', 'cats'))
else:
shutil.copy2(v, os.path.join(dest_train_path, 'validation', 'dogs'))
print('Data copied!')
src_train = './dog_cat/train'
training_path = './dog_cat_data'
organize_datasets(src_train, training_path)
#%%
def cnn_model_fn(features, labels, mode):
"""Model function for CNN."""
# Input Layer
input_layer = tf.reshape(features, [-1, 150, 150, 3])
# Convolutional Layer #1
conv1 = tf.layers.conv2d(
inputs=input_layer,
filters=32,
kernel_size=[5, 5],
padding="same",
activation=tf.nn.relu)
# Pooling Layer #1
pool1 = tf.layers.max_pooling2d(inputs=conv1, pool_size=[2, 2], strides=2)
# Convolutional Layer #2 and Pooling Layer #2
conv2 = tf.layers.conv2d(
inputs=pool1,
filters=64,
kernel_size=[5, 5],
padding="same",
activation=tf.nn.relu)
pool2 = tf.layers.max_pooling2d(inputs=conv2, pool_size=[2, 2], strides=2)
# Dense Layer
pool2_flat = tf.reshape(pool2, [-1, 37 * 37 * 64])
dense = tf.layers.dense(inputs=pool2_flat, units=1024, activation=tf.nn.relu)
dropout = tf.layers.dropout(inputs=dense, rate=0.4, training=mode == tf.estimator.ModeKeys.TRAIN)
# Logits Layer
logits = tf.layers.dense(inputs=dropout, units=2)
predictions = {
# Generate predictions (for PREDICT and EVAL mode)
"classes": tf.argmax(input=logits, axis=1),
# Add `softmax_tensor` to the graph. It is used for PREDICT and by the
# `logging_hook`.
"probabilities": tf.nn.softmax(logits, name="softmax_tensor")
}
print('predictions:', predictions)
if mode == tf.estimator.ModeKeys.PREDICT:
return tf.estimator.EstimatorSpec(mode=mode, predictions=predictions)
# Calculate Loss (for both TRAIN and EVAL modes)
onehot_labels = tf.one_hot(indices=tf.cast(labels, tf.int32), depth=2)
loss = tf.losses.softmax_cross_entropy(
onehot_labels=onehot_labels, logits=logits)
# Configure the Training Op (for TRAIN mode)
if mode == tf.estimator.ModeKeys.TRAIN:
starter_learning_rate = 0.001
global_step = tf.Variable(0, trainable=False)
learning_rate = tf.train.exponential_decay(starter_learning_rate,
global_step,
decay_steps=500,
decay_rate=0.9,
staircase=True)
optimizer = tf.train.AdagradOptimizer(learning_rate=learning_rate)
train_op = optimizer.minimize(loss=loss, global_step=tf.train.get_global_step())
return tf.estimator.EstimatorSpec(mode=mode, loss=loss, train_op=train_op)
# Add evaluation metrics (for EVAL mode)
eval_metric_ops = {"accuracy": tf.metrics.accuracy(labels=labels, predictions=predictions["classes"])}
return tf.estimator.EstimatorSpec(mode=mode, loss=loss, eval_metric_ops=eval_metric_ops)
#%%
def get_files(dogs, cats):
dogs_path = pathlib.Path(dogs)
cats_path = pathlib.Path(cats)
dogs_list = list(dogs_path.glob('*.jpg'))
cats_list = list(cats_path.glob('*.jpg'))
file_list_add = dogs_list + cats_list
random.shuffle(file_list_add)
file_list = [str(i) for i in file_list_add]
label_list = []
for t in file_list_add:
if 'cat' in t.name:
label_list.append(0)
else:
label_list.append(1)
return file_list, label_list
dogs_train = './dog_cat_data/train/dogs'
cats_train = './dog_cat_data/train/cats'
train_file_list, train_label_list = get_files(dogs_train, cats_train)
dogs_validation = './dog_cat_data/validation/dogs'
cats_validation = './dog_cat_data/validation/cats'
validation_file_list, validation_label_list = get_files(dogs_validation, cats_validation)
def _parse_function(filename, label):
image_H = image_W = 150
image_string = tf.read_file(filename)
image_decoded = tf.image.decode_jpeg(image_string)
image_resized = tf.image.resize_images(image_decoded, [image_H, image_W])
img_std = tf.image.per_image_standardization(image_resized)
return img_std, label
#%%
batch_size = 50
def train_input_fn():
'''
運行dataset = tf.data.Dataset.from_tensor_slices((filenames, labels))後，dataset的一個元素是(filename, label)。
filename是圖片的文件名，label是圖片對應的標籤。
之後通過map，將filename對應的圖片讀入，並縮放為150x150的大小。此時dataset中的一個元素是(image_resized, label)。
dataset.shuffle(buffersize=1000).batch(32).repeat()的功能是：在每個epoch內將圖片打亂組成大小為32的batch，無限重複。
最後，dataset中的一個元素是(image_std_batch, label_batch)
image_std_batch(32, 150, 150, 3)，而label_batch的形狀為(32, )，接下來我們就可以用這兩個Tensor來建立模型了。
'''
global train_file_list
global train_label_list
global num_epochs
global batch_size
filenames = tf.constant(train_file_list)
train_lables = tf.constant(train_label_list)
dataset = tf.data.Dataset.from_tensor_slices((filenames , train_lables))
dataset = dataset.map(_parse_function)
dataset = dataset.shuffle(buffer_size=1000)
dataset = dataset.repeat()
dataset = dataset.batch(batch_size)
iterator = dataset.make_one_shot_iterator()
features, labels = iterator.get_next()
return features, labels
def validation_input_fn():
global validation_file_list
global validation_label_list
global num_epochs
global batch_size
filenames = tf.constant(validation_file_list)
validation_lables = tf.constant(validation_label_list)
dataset = tf.data.Dataset.from_tensor_slices((filenames , validation_lables))
dataset = dataset.map(_parse_function)
dataset = dataset.shuffle(buffer_size=1000)
#dataset = dataset.repeat()
dataset = dataset.batch(batch_size)
iterator = dataset.make_one_shot_iterator()
validation, v_lables = iterator.get_next()
return validation, v_lables
#%% Get training and eval data
# Create the Estimator
dog_cat_classifier = tf.estimator.Estimator( model_fn=cnn_model_fn, model_dir="./cnn_model_2")
# Set up logging for predictions
tensors_to_log = {"probabilities": "softmax_tensor"}
logging_hook = tf.train.LoggingTensorHook(tensors=tensors_to_log, every_n_iter=50)
# Train the model
#train_result = dog_cat_classifier.train( input_fn=train_input_fn, steps=3000, hooks=[logging_hook])
train_result = dog_cat_classifier.train( input_fn=train_input_fn, steps=3000)
print('train_result:', train_result)
# Evaluate the model and print results
#eval_results = dog_cat_classifier.evaluate(input_fn=validation_input_fn, steps=100)
eval_results = dog_cat_classifier.evaluate(input_fn=validation_input_fn)
print('eval_results:', eval_results)
print('----------ALL Done!----------')
