code: def case_is_degenerate(cls, case):
      no_feats = len(case["feat_vocab_sizes"]) == 0
      if case["feat_merge"] != "first" and no_feats:
          return True
      if case["feat_merge"] == "first" and not no_feats:
          return True
      if (
          case["feat_merge"] == "concat"
          and case["feat_vec_exponent"] != -1
      ):
          return True
      if no_feats and case["feat_vec_exponent"] != -1:
          return True
      if len(case["feat_vocab_sizes"]) != len(case["feat_padding_idx"]):
          return True
      if case["feat_vec_size"] == 0 and case["feat_vec_exponent"] <= 0:
          return True
      if case["feat_merge"] == "sum":
          if case["feat_vec_exponent"] != -1:
              return True
          if case["feat_vec_size"] != 0:
              return True
      if case["feat_vec_size"] != 0 and case["feat_vec_exponent"] != -1:
          return True
      return False
  
file_path: OpenNMT-py/onmt/tests/test_embeddings.py
imports: import unittest
  from onmt.modules.embeddings import Embeddings
  import itertools
  from copy import deepcopy
  import torch
  from torch.nn.init import xavier_uniform_
  from onmt.tests.utils_for_tests import product_dict
label_desc: Use image node_id 1 for calling the TestEmbeddings obj's underlying member method code with example usage: obj.case_is_degenerate(cls, case) and returns: False, True, True, True, True, True, True, True, True, True