RuntimeWarning: overflow encountered in multiply

[clussificate]

python 3.6.2
numpy 1.15.4+mkl
Orange3 3.18.0
Orange3-Recommendation 0.1.3

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• Error information:

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if norm_feedback > 0: # Gradient Y
dx_yi = -eij/norm_feedback * Q[j, :]
+ lmbda * Y[feedback_u, :]
RuntimeError: Training diverged and returned NaN.