def init_from_file(self, file_name):
"""Initialize this task from file."""
dictionary = training.unpickle_from_file(file_name, gzip=False)
self._n_trajectories = dictionary['n_trajectories']
self._n_interactions = dictionary['n_interactions']
self._max_steps = dictionary['max_steps']
self._gamma = dictionary['gamma']
epochs_to_load = dictionary['all_epochs'][-self._n_replay_epochs:]
for epoch in epochs_to_load:
trajectories = training.unpickle_from_file(
self._epoch_filename(file_name, epoch), gzip=True)
self._trajectories[epoch] = trajectories
self._saved_epochs_unchanged = epochs_to_load
def load_initial_trajectories_from_path(self,
initial_trajectories_path,
dictionary_file='trajectories.pkl',
start_epoch_to_load=0):
"""Initialize trajectories task from file."""
# We assume that this is a dump generated by Trax
dictionary_file = os.path.join(initial_trajectories_path, dictionary_file)
dictionary = training.unpickle_from_file(dictionary_file, gzip=False)
# TODO(henrykm): as currently implemented this accesses only
# at most the last n_replay_epochs - this should be more flexible
epochs_to_load = dictionary['all_epochs'][start_epoch_to_load:]
all_trajectories = []
for epoch in epochs_to_load:
trajectories = training.unpickle_from_file(
self._epoch_filename(dictionary_file, epoch), gzip=True)
all_trajectories += trajectories
return all_trajectories
def load_trainer_state(output_dir, model, weights_file=None):
"""Returns a TrainerState instance loaded from the given `output_dir`."""
if weights_file is None:
weights_file = os.path.join(output_dir, 'model.pkl.gz')
if not tf.io.gfile.exists(weights_file):
return TrainerState(step=None, opt_state=None,
history=trax_history.History(), model_state=None)
elif not tf.io.gfile.exists(weights_file):
raise ValueError('File not found: %s' % weights_file)
trainer_state_dict = training.unpickle_from_file(weights_file, gzip=True)
trainer_state = trainer_state_from_dict(trainer_state_dict, model)
log('Model loaded from %s at step %d' % (weights_file, trainer_state.step))
logging.debug('From loaded model : history = %s', trainer_state.history)
return trainer_state
