code: def fit(self, ctx: Context, train_data, validate_data=None) -> None:
      self._scaler.fit(ctx, train_data)
  
imports: import logging
  import pandas
  from fate.arch import Context
  from ..abc.module import Module
label_desc: Use image node_id 2 for calling the FeatureScale obj's underlying member method code with example usage: obj.fit(ctx, train_data, validate_data) without return types