code: def test_histogram__empty_input_tensor(self):
      self._test_histogram(
          [np.array([])], list(np.linspace(-2, 2, num=10))
      )
  
file_path: pytorch/caffe2/python/operator_test/histogram_test.py
imports: import unittest
  import caffe2.python.hypothesis_test_util
  import hypothesis.strategies
  import numpy
  from caffe2.python import core, workspace
  from hypothesis import given, settings
label_desc: Use image node_id 4 for calling the TestHistogram obj's underlying member method code with example usage: obj.test_histogram__empty_input_tensor() without return types