How to get tensor Shape python

Question

I have an issue with tensors.

X.get_shape() returns (?, ?, ?, 512)

Whereas when I try to concatenate X and an other vector X=Concatenate()([X,X_add]) , it raises the exception.

A Concatenate layer requires inputs with matching shapes except for the concat axis. Got inputs shapes: [(None, 32, 32, 512), (None, 256, 256, 64)]

How do I get those shapes in order to use Cropp2D in my resnet.

Answer 1

Sometimes you have to reshape tensors before concatenating. But that won't solve your problem here, because the two tensors are of different size: 32*32*512.= 256* 256*64.