我试图使用keras model.fit_generator()来拟合模型,下面是我的发电机的定义:keras model fit_generator ValueError:检查模型目标时出现错误:期望cropping2d_4具有4个维度,但获取了具有形状的数组(32,1)
from sklearn.utils import shuffle
IMG_PATH_PREFIX = "./data/IMG/"
def generator(samples, batch_size=64):
num_samples = len(samples)
while 1: # Loop forever so the generator never terminates
shuffle(samples)
for offset in range(0, num_samples, batch_size):
batch_samples = samples[offset:offset+batch_size]
images = []
angles = []
for batch_sample in batch_samples:
name = IMG_PATH_PREFIX + batch_sample[0].split('/')[-1]
center_image = cv2.imread(name)
center_angle = float(batch_sample[3])
images.append(center_image)
angles.append(center_angle)
X_train = np.array(images)
y_train = np.array(angles)
#X_train = np.expand_dims(X_train, axis=0)
#y_train = np.expand_dims(y_train, axis=1)
print("X_train shape: ", X_train.shape, " y_train shape:", y_train.shape)
#print("X train: ", X_train)
yield X_train, y_train
train_generator = generator(train_samples, batch_size = 32)
validation_generator = generator(validation_samples, batch_size = 32)
在这里,输出形状是: X_train形状:(32,160,320,3)y_train形状:(32,)
的模型拟合代码是:
model = Sequential()
#cropping layer
model.add(Cropping2D(cropping=((50,20), (1,1)), input_shape=(160,320,3), dim_ordering='tf'))
model.compile(loss = "mse", optimizer="adam")
model.fit_generator(train_generator, samples_per_epoch= len(train_samples), validation_data=validation_generator, nb_val_samples=len(validation_samples), nb_epoch=3)
然后我得到的错误信息:
ValueError异常:错误检查时模型的目标:预计cropping2d_6有4种尺寸,但得到了与形状阵列(32 1)
有人能帮助让我知道什么是问题?