Error when checking target: expected dense_3 to have shape (3,) but got array with shape (1,)

Question

I am working on training a VGG16-like model in Keras, on a 3 classes subset from Places205, and encountered the following error:

ValueError: Error when chec         


        

Answer 1

The problem is with the shape of the labels of the data "Y".
The shape you have for the labels are (m,) and this will not work with the:

loss = "binary_crossentropy"

I believe if you don't want to play with the shape of the labels, then use:

loss = "sparse_categorical_crossentropy"