code: def additive_chi2_kernel_element(x, y):
      res = 0.0
      for i in range(len(x)):
          denom = x[i] - y[i]
          nom = x[i] + y[i]
          if nom != 0.0:
              res += denom * denom / nom
      return -res
  
file_path: cuml/python/cuml/metrics/pairwise_kernels.py
imports: from cuml.internals.input_utils import input_to_cupy_array
  from cuml.metrics import pairwise_distances
  import cuml.internals
  from cuml.internals.safe_imports import cpu_only_import
  from cuml.internals.safe_imports import gpu_only_import
  import inspect
  from cuml.internals.safe_imports import gpu_only_import_from
label_desc: Use image node_id 7 for calling a global function with example usage: additive_chi2_kernel_element(x, y) and returns: unknown