class_docstr: Base class for sequential models
class_docstr_tok: ["Base","class","for","sequential","models"]
docstr: Subclass will implement this.
docstr_tok: ["Subclass","will","implement","this","."]
code: def _build_seq_graph(self):
      """Subclass will implement this."""
      pass
  
file_path: recommenders/recommenders/models/deeprec/models/sequential/sequential_base_model.py
imports: import os
  import abc
  import numpy
  import tensorflow
  from recommenders.models.deeprec.models.base_model import BaseModel
  from recommenders.models.deeprec.deeprec_utils import cal_metric, load_dict
label_desc: Use image node_id 2 for calling the SequentialBaseModel obj's underlying member method code with example usage: obj._build_seq_graph() without return types