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predict.py
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# Code from https://gist.github.com/baraldilorenzo/07d7802847aaad0a35d3
from keras.models import Sequential
from keras.layers.core import Flatten, Dense, Dropout
from keras.layers.convolutional import Convolution2D, MaxPooling2D, ZeroPadding2D
from cafee_classes import class_names
from keras.optimizers import SGD
import argparse
import cv2
import numpy as np
def VGG_16(weights_path=None):
model = Sequential()
model.add(ZeroPadding2D((1, 1), input_shape=(3, 224, 224)))
model.add(Convolution2D(64, 3, 3, activation='relu'))
model.add(ZeroPadding2D((1, 1)))
model.add(Convolution2D(64, 3, 3, activation='relu'))
model.add(MaxPooling2D((2, 2), strides=(2, 2)))
model.add(ZeroPadding2D((1, 1)))
model.add(Convolution2D(128, 3, 3, activation='relu'))
model.add(ZeroPadding2D((1, 1)))
model.add(Convolution2D(128, 3, 3, activation='relu'))
model.add(MaxPooling2D((2, 2), strides=(2, 2)))
model.add(ZeroPadding2D((1, 1)))
model.add(Convolution2D(256, 3, 3, activation='relu'))
model.add(ZeroPadding2D((1, 1)))
model.add(Convolution2D(256, 3, 3, activation='relu'))
model.add(ZeroPadding2D((1, 1)))
model.add(Convolution2D(256, 3, 3, activation='relu'))
model.add(MaxPooling2D((2, 2), strides=(2, 2)))
model.add(ZeroPadding2D((1, 1)))
model.add(Convolution2D(512, 3, 3, activation='relu'))
model.add(ZeroPadding2D((1, 1)))
model.add(Convolution2D(512, 3, 3, activation='relu'))
model.add(ZeroPadding2D((1, 1)))
model.add(Convolution2D(512, 3, 3, activation='relu'))
model.add(MaxPooling2D((2, 2), strides=(2, 2)))
model.add(ZeroPadding2D((1, 1)))
model.add(Convolution2D(512, 3, 3, activation='relu'))
model.add(ZeroPadding2D((1, 1)))
model.add(Convolution2D(512, 3, 3, activation='relu'))
model.add(ZeroPadding2D((1, 1)))
model.add(Convolution2D(512, 3, 3, activation='relu'))
model.add(MaxPooling2D((2, 2), strides=(2, 2)))
model.add(Flatten())
model.add(Dense(4096, activation='relu'))
model.add(Dropout(0.5))
model.add(Dense(4096, activation='relu'))
model.add(Dropout(0.5))
model.add(Dense(1000, activation='softmax'))
if weights_path:
model.load_weights(weights_path)
return model
def predict(model, im, order=True):
im = im.astype(np.float32)
im[:, :, 0] -= 103.939
im[:, :, 1] -= 116.779
im[:, :, 2] -= 123.68
im = im.transpose((2, 0, 1))
im = np.expand_dims(im, axis=0)
out = model.predict(im).flatten()
if order:
n_cat = 5
out_order = np.argsort(-out).flatten()
class_names_ordered = [class_names[i] for i in out_order]
probs_ordered = [np.round(out[i], 3) for i in list(out_order)]
output = zip(class_names_ordered[0:n_cat], probs_ordered[0:n_cat])
else:
output = zip(class_names, out)
return output
def load_model(modelpath):
model = VGG_16(modelpath)
sgd = SGD(lr=0.1, decay=1e-6, momentum=0.9, nesterov=True)
model.compile(optimizer=sgd, loss='categorical_crossentropy')
return model
if __name__ == "__main__":
ap = argparse.ArgumentParser()
ap.add_argument('-i', '--image', required=True, help='Path to the image')
args = vars(ap.parse_args())
im = cv2.resize(cv2.imread(args['image']), (224, 224)).astype(np.float32)
# Test pretrained model
model = load_model('vgg16_weights.h5')
output = predict(model, im)
print output