change win64 numpy default int32 to int64

[jian-mo]

add dtype specification for the random seed so that win64 numpy can use correct int64 rather than 32 bit int which will not be long enough for the seed

[codecov[bot]]

Codecov Report

Merging #1325 (8535c63) into master (310f22b) will not change coverage. The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master    #1325   +/-   ##
=======================================
  Coverage   49.77%   49.77%           
=======================================
  Files         162      162           
  Lines       11210    11210           
=======================================
  Hits         5580     5580           
  Misses       5630     5630           

Impacted Files	Coverage Δ
jiant/shared/initialization.py	33.33% <0.00%> (ø)

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