code: def test_callable_affinity():
      affinity = partial(
          metrics.pairwise.pairwise_kernels,
          metric="rbf",
          filter_params=True,
          gamma=1.0 / len(X),
      )
      sc = SpectralClustering(affinity=affinity, gamma=None)
      sc.fit(X)
  
file_path: dask-ml/tests/test_spectral_clustering.py
imports: from functools import partial
  import numpy
  import pytest
  import sklearn.cluster
  from dask_ml import metrics
  from dask_ml.cluster import SpectralClustering
  from dask_ml.datasets import make_blobs
label_desc: Use image node_id 3 for calling a global function with example usage: test_callable_affinity() without return types