code: def rsqrt(x, dtype):
      return numpy.reciprocal(numpy.sqrt(x, dtype=dtype), dtype=dtype)
  
file_path: chainer/tests/chainer_tests/functions_tests/math_tests/test_sqrt.py
imports: import unittest
  import numpy
  import chainer.functions
  from chainer import testing
label_desc: Use image node_id 2 for calling a global function with example usage: rsqrt(x, dtype) and returns: numpy