While making a machine learning model in keras, I checked the shape of an element that gives the output (?,12).
I went through this stackoverflow answer but did'nt understand what exactly (?,12) shows?
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Assume that you would pass a matrix of shape (n, 12). Where the columns are fixed to 12, but rows could vary through runs. – pissall Sep 20 '19 at 10:00
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it means it's a variable shape. This could be for example the batch size.
Have a look at What is the meaning of the "None" in model.summary of KERAS?
cookiemonster
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