Fix unit tests to pass under pytorch v0.3.0 branch #556
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Addresses #554
mean_and_vartests to testsqrt(variance)rather thanvariance, so that mean and variance can reasonably share a precision parameter. (This probabilistic test fails in PyTorchv0.3.0due to slightly changed randomness.)test_gradient_step_golden()test because it is not stable across pytorch versions.