code: def _arr_to_similarity_mat(arr):
      arr = arr.reshape(1, -1)
      return np.pad(arr, [(arr.shape[1] - 1, 0), (0, 0)], "edge")
  
file_path: cuml/python/cuml/tests/dask/test_dask_label_encoder.py
imports: from cuml.common.exceptions import NotFittedError
  import pytest
  from cuml.internals.safe_imports import cpu_only_import
  import cuml
  from cuml.dask.preprocessing.LabelEncoder import LabelEncoder
  from cuml.internals.safe_imports import gpu_only_import
label_desc: Use image node_id 1 for calling a global function with example usage: _arr_to_similarity_mat(arr) and returns: np