parameters: (self, run_context)
docstring: Called before each epoch beginning.
  
          Args:
              run_context (RunContext): Include some information of the model.
docstring_summary: Called before each epoch beginning.
docstring_tokens: Called before each epoch beginning .
function: def epoch_begin(self, run_context):
          """
          Called before each epoch beginning.
  
          Args:
              run_context (RunContext): Include some information of the model.
          """
function_tokens: def epoch_begin ( self , run_context ) :