class_docstr: Base class for exploring graphs.
class_docstr_tok: ["Base","class","for","exploring","graphs","."]
code: def _check_seed(self, seed):
      if seed is not None:
          if type(seed) != int:
              self._raise_error(
                  "The random number generator seed value, seed, should be integer type or None."
              )
          if seed < 0:
              self._raise_error(
                  "The random number generator seed value, seed, should be non-negative integer or None."
              )
  
imports: import numpy
  import warnings
  from collections import defaultdict, deque
  from scipy import stats
  from scipy.special import softmax
  from ..core.schema import GraphSchema
  from ..core.graph import StellarGraph
  from ..core.utils import is_real_iterable
  from ..core.validation import require_integer_in_range, comma_sep
  from ..random import random_state
  from abc import ABC, abstractmethod
label_desc: Use image node_id 3 for calling the GraphWalk obj's underlying member method code with example usage: obj._check_seed(seed) without return types