def _respond(metrics: workload.Response) -> None:
# Only the chief container should actually respond to TRAIN_FOR_STEP.
if self.rendezvous_info.get_rank() != 0:
respond(workload.Skipped())
return
check_not_isinstance(metrics, workload.Skipped,
"Chief skipped a workload.")
metrics = cast(workload.Metrics, metrics)
batch_metrics = metrics["batch_metrics"]
# Sanity-check training metrics.
det.util.validate_batch_metrics(batch_metrics)
check_len(batch_metrics, num_batches)
for callback in self.callbacks:
callback.on_train_step_end(wkld.step_id, batch_metrics)
self.tensorboard_mgr.sync()
# Send the response up.
respond({
"type": "WORKLOAD_COMPLETED",
"workload": wkld,
"start_time": start_time,
"end_time": _current_timestamp(),
"metrics": metrics,
})
def _respond(in_response: workload.Response) -> None:
# Only the chief container should actually respond to TRAIN_FOR_STEP.
if self.rendezvous_info.get_rank() != 0:
respond(workload.Skipped())
return
check_not_isinstance(in_response, workload.Skipped,
"Chief skipped a workload.")
in_response = cast(workload.Metrics, in_response)
metrics = in_response["metrics"]
metrics = cast(workload.Metrics, metrics)
if in_response.get("invalid_hp", False):
out_response = {
"type": "WORKLOAD_COMPLETED",
"workload": wkld,
"start_time": start_time,
"end_time": _current_timestamp(),
"metrics": metrics,
}
out_response["exited_reason"] = "INVALID_HP"
respond(out_response)
return
batch_metrics = metrics["batch_metrics"]
# Sanity-check training metrics.
det.util.validate_batch_metrics(batch_metrics)
check_len(batch_metrics, wkld.num_batches)
for callback in self.callbacks:
callback.on_train_step_end(wkld.step_id, wkld.num_batches,
wkld.total_batches_processed,
metrics)
self.tensorboard_mgr.sync()
out_response = {
"type": "WORKLOAD_COMPLETED",
"workload": wkld,
"start_time": start_time,
"end_time": _current_timestamp(),
"metrics": metrics,
}
if in_response.get("stop_requested", False):
out_response["exited_reason"] = "USER_CANCELED"
# Send the response up.
respond(out_response)
def _respond(in_response: workload.Response) -> None:
# Only the chief container should actually respond to COMPUTE_VALIDATION_METRICS.
if self.rendezvous_info.get_rank() != 0:
respond(workload.Skipped())
return
check_not_isinstance(in_response, workload.Skipped,
"Chief skipped a workload.")
in_response = cast(Dict[str, Any], in_response)
metrics = in_response["metrics"]
metrics = cast(workload.Metrics, metrics)
v_metrics = metrics["validation_metrics"]
for callback in self.callbacks:
callback.on_validation_step_end(wkld.step_id,
wkld.total_batches_processed,
v_metrics)
self.tensorboard_mgr.sync()
# Check that the validation metrics computed by the model code
# includes the metric used by the search method.
searcher_metric = self.env.experiment_config["searcher"]["metric"]
if searcher_metric not in v_metrics:
raise AssertionError(
"Search method is configured to use metric '{}' but model "
"definition returned validation metrics {}. The metric "
"used by the search method must be one of the validation "
"metrics returned by the model definition.".format(
searcher_metric, list(v_metrics.keys())))
sys.exit(1)
non_serializable_metrics = set()
# NaN and bytes are not JSON serializable. None does not have a
# canonical JSON representation. In the case of trial implementation bugs
# or numerical instability issues, validation metric functions may
# return None or NaN values. For now, immediately fail any trial that
# encounters such a None metric. For NaN metrics, if it's the target of
# the searcher, we set it to +/- max_float depending on if the searcher
# is optimizing for the max or min. NaN metrics which are not the
# target of the searcher are dropped.
# TODO (DET-2495): Do not replace NaN metric values.
for metric_name, metric_value in v_metrics.items():
metric_is_none = metric_value is None
metric_is_nan = tensorboard.metric_writers.util.is_numerical_scalar(
metric_value) and math.isnan(metric_value)
if metric_is_none or metric_is_nan:
raise AssertionError("Validation metric '{}' returned "
"an invalid scalar value: {}".format(
metric_name, metric_value))
sys.exit(1)
if isinstance(metric_value, (bytes, bytearray)):
non_serializable_metrics.add(metric_name)
if len(non_serializable_metrics):
logging.warning("Removed non serializable metrics: %s",
", ".join(non_serializable_metrics))
for metric_name in non_serializable_metrics:
del v_metrics[metric_name]
out_response = {
"type": "WORKLOAD_COMPLETED",
"workload": wkld,
"start_time": start_time,
"end_time": _current_timestamp(),
"metrics": metrics,
}
if in_response.get("stop_requested", False):
out_response["exited_reason"] = "USER_CANCELED"
respond(out_response)
