code: def _compute_b2revb(edge_index: np.ndarray) -> List[int]:
      """Every edge in a grover graph is a directed edge. Hence, a bond
      is represented by two edges of opposite directions. b2revb is a representation
      which stores for every edge, the index of reverse edge of that edge.
  
      Parameters
      ----------
      edge_index: np.array
          Graph connectivity in COO format with shape [2, num_edges]
  
      Returns
      -------
      b2revb: List[int]
          A mapping where an element at an index contains the index of the reverse bond.
  
      Example
      -------
      >>> import numpy as np
      >>> edge_index = np.array([[0, 1, 2, 4], [1, 0, 4, 2]])
      >>> _compute_b2revb(edge_index)
      [1, 0, 3, 2]
      """
      b2revb = [0] * edge_index.shape[1]
      for i, bond in enumerate(edge_index.T):
          for j, (sa, da) in enumerate(edge_index.T):
              if sa == bond[1] and da == bond[0]:
                  b2revb[i] = j
      return b2revb
  
file_path: deepchem/deepchem/utils/grover.py
imports: import numpy
  from typing import List, Any
  from numpy.typing import ArrayLike
  from deepchem.feat.graph_data import BatchGraphData, GraphData
  from deepchem.feat.molecule_featurizers.dmpnn_featurizer import GraphConvConstants
label_desc: Use image node_id 3 for calling a global function with example usage: _compute_b2revb(edge_index) and returns: b2revb