code: def additive_chi2_kernel(X, Y):
      return custom_kernel(X, Y, additive_chi2_kernel_element)
  
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 8 for calling a global function with example usage: additive_chi2_kernel(X, Y) and returns: custom_kernel