Numpy Import Convention (#3307)

* Added torch.clamp inside torch.log calls

Added torch.clamp in torch.log to avoid too small numbers, which would result in NaN

* Added "as np" to numpy import

Added "as np" to numpy import, matching standard convention and consistency in code

* Fix pylint issues

* Revert "Added torch.clamp inside torch.log calls"

This reverts commit 87f5064.

pyro/contrib/epidemiology/util.py

@@ -1,7 +1,7 @@
 # Copyright Contributors to the Pyro project.
 # SPDX-License-Identifier: Apache-2.0
 
-import numpy
+import numpy as np
 import torch
 
 import pyro
@@ -168,7 +168,7 @@ def align_samples(samples, model, particle_dim):
     ],
 ]
 
-W16 = numpy.array(W16)
+W16 = np.array(W16)
 
 
 def compute_bin_probs(s, num_quant_bins):