yifeim opened a new issue #17786: pick with multi-dimensional indices URL: https://github.com/apache/incubator-mxnet/issues/17786 ## Description - Support `pick(data, [[0,1,2],[1,2,3]]) = [[data[0,0], data[0,1], data[0,2], [data[1,1], data[1,2], data[1,3]]`. - As a side note, add a "fill-value" mode to out-of-bound indices. This seems to be a logical replacement to the original "raise"-mode proposal, which is "not supported yet". - The new functions should also support `axis` parameter in backward compatible ways. ## References - Multi-dimensional `take` is already implemented as `take(data, [[0,3],[-1,-2]]) = [[data[0], data[3]], [data[-1], data[-2]]`. - Since `pick` is modeled as `batch_take`, the extension seems natural. - The expected result for a fill-value mode could be verified as ``` F.pick(data, indices, mode='fill', fill_value=fv) = F.where( (indices>=0) * (indices<data.shape_array().slice_axis(axis=0, begin=-1, end=None)), F.pick(data, indices), F.ones_like(indices.astype(data.dtype))*fv) ```
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