sess_training_session: Create Training Session Object
In Microsoft/CNTK-R: R Interface to the Microsoft Cognitive Toolkit (CNTK)

A factory function to create a training session object.

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sess_training_session(trainer, mb_source, mb_size, model_inputs_to_streams,
  progress_frequency = NULL, max_samples = NULL, checkpoint_config = NULL,
  cv_config = NULL, test_config = NULL)

`trainer`	(Trainer): trainer
`mb_source`	(MinibatchSource): minibatch source used for training
`mb_size`	(minibatch_size_schedule): minibatch schedule for training
`model_inputs_to_streams`	(dict): mapping between input variables and input streams
`progress_frequency`	(int): frequency in samples for aggregated progress printing
`max_samples`	(int): maximum number of samples used for training
`checkpoint_config`	(~CheckpointConfig): checkpoint configuration
`cv_config`	(~CrossValidationConfig): cross validation configuration
`test_config`	(~TestConfig): test configuration