code: def fit(self, input_df, validation_df=None, mc=False, epoch_num=20):
      self.model.fit_incr(
          input_df, validation_df, mc=mc, verbose=1, epochs=epoch_num
      )
      print("Fit done!")
  
file_path: BigDL/python/chronos/src/bigdl/chronos/autots/deprecated/pipeline/time_sequence.py
imports: import os
  import time
  from bigdl.chronos.autots.deprecated.feature.utils import save_config
  from bigdl.chronos.autots.deprecated.pipeline.base import Pipeline
  from bigdl.chronos.autots.deprecated.model.time_sequence import TimeSequenceModel
  from bigdl.chronos.autots.deprecated.pipeline.parameters import DEFAULT_CONFIG_DIR, DEFAULT_PPL_DIR
  from bigdl.chronos.utils import deprecated
label_desc: Use image node_id 3 for calling the TimeSequencePipeline obj's underlying member method code with example usage: obj.fit(input_df, validation_df, mc, epoch_num) without return types