code: def in_degree(self, node):
      self._check_node_in_graph(node)
      return len(self._predecessors[node])
  
file_path: baikal/baikal/_core/digraph.py
imports: from collections import deque, defaultdict, OrderedDict
label_desc: Use image node_id 12 for calling the DiGraph obj's underlying member method code with example usage: obj.in_degree(node) and returns: len