Allow users to pass a float for constant learning rate #293
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The current API requires user to pass a function of the index of the current iteration, even when the learning rate is constant. However, in practice most people use a constant learning rate (even if they shouldn't, but who are we to judge?) and we should simplify that pattern of use.
This commit thus allows users to pass either a function, either a float as learning rate to the kernel builder. It will raise an exception for any other type.