code: def ref_dequantize_linear(x, scale, zero_point):
      return (x - zero_point) * scale
  
file_path: nnabla/python/test/function/test_dequantize_linear.py
imports: import pytest
  import numpy
  import nnabla.functions
  from nbla_test_utils import list_context
label_desc: Use image node_id 2 for calling a global function with example usage: ref_dequantize_linear(x, scale, zero_point) and returns: unknown