Test accumulating gradient collector #2111
Merged
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This adds additional documentation and testing to define the API for the gradient collector. Specifically, it focuses on the gradient accumulating behavior and adds a restriction to creating multiple simultaneous global gradient collectors.
It also raises an issue for dealing with MXNet to accumulate gradients. I investigated both the setRequiresGradient with ADD mode and backwards with retainGrads and neither was correctly implementing the gradient accumulation behavior.
As this is not a terribly significant use case, I will just leave it as a TODO until there are any users who specifically request it.