code: def dot_metric(a, b):
      return -numpy.dot(a, b)
  
file_path: annoy/test/dot_index_test.py
imports: import random
  import numpy
  import pytest
  from annoy import AnnoyIndex
label_desc: Use image node_id 1 for calling a global function with example usage: dot_metric(a, b) and returns: unknown