haojin2 edited a comment on issue #11925: mxnet.ndarray.stack : PLEASE UPDATE DOC URL: https://github.com/apache/incubator-mxnet/issues/11925#issuecomment-408711285 Can you post the exact instructions you used here? This is what I got: ``` >>> import mxnet as mx >>> a = mx.nd.array([1,2]) >>> b = mx.nd.array([3,4]) >>> mx.nd.stack(a, b) [[ 1. 2.] [ 3. 4.]] <NDArray 2x2 @cpu(0)> ``` Maybe what you did was: ``` >>> import mxnet as mx >>> a = [1,2] >>> b = [3,4] >>> mx.nd.stack(a, b) Traceback (most recent call last): File "<stdin>", line 1, in <module> File "<string>", line 39, in stack AssertionError: Positional arguments must have NDArray type, but got [1, 2] ``` ?
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