kpot commented on issue #8337: mx.autograd.grad works or fails depending on use of slices URL: https://github.com/apache/incubator-mxnet/issues/8337#issuecomment-337796013 @ZiyueHuang Yes, I think the empty line is indeed the argument `''`. But when I replace `mx.nd.ones_like(b)` with `mx.nd.ones((1,))` I still get the same error. Are you sure that when it worked for you, you actually did use slicing? Just to be on the same page, here's the full code that fails, even though I believe it shouldn't: ``` import mxnet as mx from mxnet import nd, autograd ctx = mx.cpu() a = mx.nd.array([1, 2, 3, 4], ctx=ctx) a.attach_grad() with autograd.record(): b = nd.sum(2 * (a[0:4] ** 2)) # works without slicing grads = autograd.grad(b, [a], create_graph=True, retain_graph=True) da_sym = autograd.get_symbol(grads[0]) executor = da_sym.bind(ctx=ctx, args=[nd.ones_like(b), a]) executor.forward() print(executor.outputs[0]) ```
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