ConvRNNCells dynamic input_shape

[HaydenFaulkner]

Same question as the closed #8848, is there a way to dynamically set the input shape for ConvLSTMCell and ConvGRUCell?

Thanks,
Hayden

[lanking520]

Usually if you are not sure about the shape of a certain dimension, you can set it to 0.
@haojin2 if you know anyone can answer this

[szha]

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