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from keras.preprocessing.image import ImageDataGenerator | |
import pandas as pd | |
import Augmentor | |
from PIL import Image | |
import random | |
import numpy as np | |
import matplotlib.pyplot as plt | |
import math | |
import config | |
def plot_imgs_from_generator(generator, number_imgs_to_show=9): | |
print ('Plotting images...') | |
n_rows_cols = int(math.ceil(math.sqrt(number_imgs_to_show))) | |
plot_index = 1 | |
x_batch, _ = next(generator) | |
while plot_index <= number_imgs_to_show: | |
plt.subplot(n_rows_cols, n_rows_cols, plot_index) | |
plt.imshow(x_batch[plot_index-1]) | |
plot_index += 1 | |
plt.show() | |
def augment_image(np_img): | |
p = Augmentor.Pipeline() | |
p.rotate(probability=1, max_left_rotation=5, max_right_rotation=5) | |
p.flip_left_right(probability=0.5) | |
p.random_distortion(probability=0.25, grid_width=2, grid_height=2, magnitude=8) | |
p.random_color(probability=1, min_factor=0.8, max_factor=1.2) | |
p.random_contrast(probability=.5, min_factor=0.8, max_factor=1.2) | |
p.random_brightness(probability=1, min_factor=0.5, max_factor=1.5) | |
image = [Image.fromarray(np_img.astype('uint8'))] | |
for operation in p.operations: | |
r = round(random.uniform(0, 1), 1) | |
if r <= operation.probability: | |
image = operation.perform_operation(image) | |
image = [np.array(i).astype('float64') for i in image] | |
return image[0] | |
image_processor = ImageDataGenerator( | |
rescale=1./255, | |
preprocessing_function=augment_image) | |
# subtract validation size from training data | |
with open(config.CROPPED_IMGS_INFO_FILE) as f: | |
for i, _ in enumerate(f): | |
pass | |
training_n = i - config.VALIDATION_SIZE | |
train_df=pd.read_csv(config.CROPPED_IMGS_INFO_FILE, nrows=training_n) | |
train_generator=image_processor.flow_from_dataframe( | |
dataframe=train_df, | |
directory=config.CROPPED_IMGS_DIR, | |
x_col='name', | |
y_col='bmi', | |
class_mode='other', | |
color_mode='rgb', | |
target_size=(config.RESNET50_DEFAULT_IMG_WIDTH,config.RESNET50_DEFAULT_IMG_WIDTH), | |
batch_size=config.TRAIN_BATCH_SIZE) |
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