class_docstr: This model will load a score file, and return score at date exists in score file.
code: def fit(
      self,
      x_train,
      y_train,
      x_valid,
      y_valid,
      w_train=None,
      w_valid=None,
      **kwargs,
  ):
      return
  
file_path: qlib/qlib/contrib/online/online_model.py
imports: import random
  import pandas
  from ...data import D
  from ..model.base import Model
label_desc: Use image node_id 5 for calling the ScoreFileModel obj's underlying member method code with example usage: obj.fit(x_train, y_train, x_valid, y_valid, w_train, w_valid) without return types