code: def calculate_similarity(u, v, data_type=np.float64):
      if u.dtype is not data_type:
          u = u.astype(data_type)
      if v.dtype is not data_type:
          v = v.astype(data_type)
      return np.dot(u, v) / (np.linalg.norm(u) * np.linalg.norm(v))
  
imports: import os
  import sys
  import os.path
  import numpy
  import six
  from py_proto import mace_pb2
  from utils import util
  from utils.config_parser import DataFormat
  from utils.config_parser import Platform
  from utils.util import mace_check
label_desc: Use image node_id 3 for calling a global function with example usage: calculate_similarity(u, v, data_type) and returns: unknown