docstr: Set the context's execution phase to train.
docstr_tok: ["Set","the","context","'s","execution","phase","to","train","."]
code: def train(self) -> "CX":
      """
      Set the context's execution phase to train.
      """
      new_self = self._copy(copy_func="_copy_train")
      new_self.set_execution_phase(ExecutionPhase.TRAIN)
      return new_self
  
imports: import logging
  from neuraxle.base import ExecutionContext, ExecutionPhase
  from neuraxle.logging.logging import NeuraxleLogger
  from neuraxle.metaopt.data.vanilla import BaseDataclass, ScopedLocation, SubDataclassT
  from neuraxle.metaopt.repositories.repo import HyperparamsRepository, SynchronizedHyperparamsRepositoryWrapper, VanillaHyperparamsRepository
label_desc: Use image node_id 10 for calling the AutoMLContext obj's underlying member method code with example usage: obj.train() and returns: new_self