code: def __init__(self, path):
      self._degree = np.load(
          os.path.join(path, "degree.npy"), mmap_mode="r"
      )
      self._sorted_u = np.load(
          os.path.join(path, "sorted_u.npy"), mmap_mode="r"
      )
      self._sorted_v = np.load(
          os.path.join(path, "sorted_v.npy"), mmap_mode="r"
      )
      self._sorted_eid = np.load(
          os.path.join(path, "sorted_eid.npy"), mmap_mode="r"
      )
      self._indptr = np.load(
          os.path.join(path, "indptr.npy"), mmap_mode="r"
      )
  
imports: import os
  import numpy
  import pickle
  import time
  import pgl.graph_kernel
  from collections import defaultdict
label_desc: Use image node_id 1 to create a new MemmapEdgeIndex object from inherited base classes: EdgeIndex with example: obj = MemmapEdgeIndex(path)