Support optional flag to clamp gradient in 'backward' to prevent crash #45
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This commit addresses a very intermittent, but deadly crash bug that is destroying my training runs - a very occasional infinite gradient in the 'backward' function.
In this commit, functionality remains unchanged by default.
However, an optional flag has been added that allows clamping the gradient in the 'backward' function. The flag takes the form of an int or sequence giving the min/max value.
An optional third value in the passed sequence is interpreted as a Boolean that indicates whether to print a warning to the console whenever an infinite gradient is clamped. The default is False.
Support for PyTorch only.