I want to train a deep network starting with the following layer:
model = Sequential()
model.add(Conv2D(32, 3, 3, input_shape=(32, 32, 3)))
using
history = model.fit_generator(get_training_data(),
samples_per_epoch=1, nb_epoch=1,nb_val_samples=5,
verbose=1,validation_data=get_validation_data()
with the following generator:
def get_training_data(self):
while 1:
for i in range(1,5):
image = self.X_train[i]
label = self.Y_train[i]
yield (image,label)
(validation generator looks similar).
During training, I get the error:
Error when checking model input: expected convolution2d_input_1 to have 4
dimensions, but got array with shape (32, 32, 3)
How can that be, with a first layer
model.add(Conv2D(32, 3, 3, input_shape=(32, 32, 3)))
?
The input shape you have defined is the shape of a single sample. The model itself expects some array of samples as input (even if its an array of length 1).
Your output really should be 4-d, with the 1st dimension to enumerate the samples. i.e. for a single image you should return a shape of (1, 32, 32, 3).
You can find more information here under "Convolution2D"/"Input shape"
Edit: Based on Danny's comment below, if you want a batch size of 1, you can add the missing dimension using this:
image = np.expand_dims(image, axis=0)