anirudhacharya commented on issue #12404: init.Constant does not work in symbol URL: https://github.com/apache/incubator-mxnet/issues/12404#issuecomment-488880746 The error happens here - https://github.com/apache/incubator-mxnet/blob/master/python/mxnet/initializer.py#L116 while trying to serialize a `numpy` array into json format. I think the fix is instead of using the in-built `json.dumps` we should write our own custom JSONEncoder and JSONDecoder that will extend the one implemented in `json` package. This implementation should handle `numpy.ndarrays`. I will try to do that.
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