Use float(η), and fixed eps
#120
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Fixes #119, by making
Adam(0)promote to a float. Chooses Float32. This is whatClipGrad(10)already did, to makeadjusthappy.Also changes
epsso thatAdam(0.1)has the same value asAdam(0.1f0). Not entirely sure that's ideal. WithAdam(0.1)the gradient update is done in Float64 even if all arrays are Float32.