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[WIP] SPINN test #12
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[WIP] SPINN test #12
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We need this because a subtle distinction between NumPy/PyTorch's basic slicing and advanced indexing behavior means that no single value for the batch dimension index will get us the right behavior for example-level programming, given that we're working with a user-visible batch dimension. The Matchbox equivalent of truly example-level `arr[0]` (basic slicing) is `arr[:, 0]`, but the equivalent of `arr[[0]]` is `arr[[0], [0]]`. With the sentinel they can be written as `arr[BD, 0]` and `arr[BD, [0]]`.
I'm pretty confident there's a logic bug somewhere in this commit.
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