Flatten dose not compatible with GlobalMaxPooling1D

[sun9700]

Tensor with shape [batch_size,samples, feathers ] pass GlobalMaxPooling1D became [batch_size,feathers ]
Then the Flatten complains：
Exception: Input 0 is incompatible with layer flatten_1: expected ndim >= 3, found ndim=2

please add a parameter to keep the second dim=1

[keunwoochoi]

I don't use GlobalMAxPooling1D.