[GitHub] szha commented on issue #9288: Get HybridBlock layer shape on runtime

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szha commented on issue #9288: Get HybridBlock layer shape on runtime
URL: https://github.com/apache/incubator-mxnet/issues/9288#issuecomment-358529606
 
 
   `infer_shape` might have been a misnomer because what it does is actually inferring the shapes of parameters, and what you expect as well as the `infer_shape` that symbol provides is for inferring output shape.
   
   In general, in HybridBlock you shouldn't depend on the exact shape of input, because otherwise it indicates that the computation graph may change depending on the shape, thus rendering it unsuitable for HybridBlock. That said, there are plenty of ways to get around the dependency on the exact value of shape (e.g. [special placeholders in reshape](https://mxnet.incubator.apache.org/versions/master/api/python/symbol/symbol.html?highlight=reshape#mxnet.symbol.reshape), `XX_like` operators such as [zeros_like](https://mxnet.incubator.apache.org/versions/master/api/python/symbol/symbol.html?highlight=reshape#mxnet.symbol.zeros_like)).
   
   If you could share exactly how you depend on the shape, others and I might be able to help more.

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