Hparams: Generate metric values for data provider-based session group…

…s. (#6543)

Generate metric values for hparams plugin `/session_groups` requests
when the session groups are generated from
DataProvider.read_hyperparameters().

We need to reuse the logic introduced in
#6539 to generate
metric_infos for each session group and also query for scalar values. We
reuse the existing logic to join the two collections of data into
metric_values for the `/session_groups` request.

We also continue the work begun in
#6541 to improve how we
generate sessions - in this case also handling cases where experiment_id
is not specified for the session. This became urgently necessary to
address in order to get new tests in list_session_groups_test.py to work
with existing test data.

tensorboard/plugins/hparams/backend_context.py

@@ -403,7 +403,7 @@ def compute_metric_infos_from_data_provider_session_groups(
         self, ctx, experiment_id, session_groups
     ):
         session_runs = set(
-            f"{s.experiment_id}/{s.run}" if s.run else s.experiment_id
+            generate_data_provider_session_name(experiment_id, s)
             for sg in session_groups
             for s in sg.sessions
         )
@@ -460,6 +460,22 @@ def _compute_metric_names(self, ctx, experiment_id, session_runs):
         return metric_names_list
 
 
+def generate_data_provider_session_name(experiment_id, session):
+    """Generates a name from a HyperparameterSesssionRun.
+
+    If the HyperparameterSessionRun contains no experiment or run information
+    then the name is set to the original experiment_id.
+    """
+    if not session.experiment_id and not session.run:
+        return experiment_id
+    elif not session.experiment_id:
+        return session.run
+    elif not session.run:
+        return session.experiment_id
+    else:
+        return f"{session.experiment_id}/{session.run}"
+
+
 def _find_longest_parent_path(path_set, path):
     """Finds the longest "parent-path" of 'path' in 'path_set'.
 

tensorboard/plugins/hparams/backend_context_test.py

@@ -652,6 +652,43 @@ def test_experiment_from_data_provider_session_group_without_run_name(self):
         """
         self.assertProtoEquals(expected_exp, actual_exp)
 
+    def test_experiment_from_data_provider_session_group_without_experiment_name(
+        self,
+    ):
+        self._mock_tb_context.data_provider.list_tensors.side_effect = None
+        self._hyperparameters = provider.ListHyperparametersResult(
+            hyperparameters=[],
+            session_groups=[
+                provider.HyperparameterSessionGroup(
+                    root=provider.HyperparameterSessionRun(
+                        experiment_id="", run="exp/session_1"
+                    ),
+                    sessions=[
+                        provider.HyperparameterSessionRun(
+                            experiment_id="", run="exp/session_1"
+                        ),
+                    ],
+                    hyperparameter_values=[],
+                ),
+            ],
+        )
+        actual_exp = self._experiment_from_metadata()
+        expected_exp = """
+            metric_infos: {
+              name: {group: '', tag: 'accuracy'}
+            }
+            metric_infos: {
+              name: {group: '', tag: 'loss'}
+            }
+            metric_infos: {
+              name: {group: 'eval', tag: 'loss'}
+            }
+            metric_infos: {
+              name: {group: 'train', tag: 'loss'}
+            }
+        """
+        self.assertProtoEquals(expected_exp, actual_exp)
+
     def test_experiment_from_data_provider_old_response_type(self):
         self._hyperparameters = [
             provider.Hyperparameter(

tensorboard/plugins/hparams/list_session_groups.py

@@ -25,10 +25,12 @@
 
 from tensorboard.data import provider
 from tensorboard.plugins.hparams import api_pb2
+from tensorboard.plugins.hparams import backend_context as backend_context_lib
 from tensorboard.plugins.hparams import error
 from tensorboard.plugins.hparams import json_format_compat
 from tensorboard.plugins.hparams import metadata
 from tensorboard.plugins.hparams import metrics
+from tensorboard.plugins.hparams import plugin_data_pb2
 
 
 class Handler:
@@ -93,13 +95,15 @@ def _session_groups_from_tags(self):
             hparams_run_to_tag_to_content,
             # Don't pass any information from the DataProvider since we are only
             # examining session groups based on tag metadata
-            [],
+            provider.ListHyperparametersResult(
+                hyperparameters=[], session_groups=[]
+            ),
         )
         extractors = _create_extractors(self._request.col_params)
         filters = _create_filters(self._request.col_params, extractors)
 
         session_groups = self._build_session_groups(
-            hparams_run_to_tag_to_content, experiment
+            hparams_run_to_tag_to_content, experiment.metric_infos
         )
         session_groups = self._filter(session_groups, filters)
         self._sort(session_groups, extractors)
@@ -116,16 +120,37 @@ def _session_groups_from_data_provider(self):
             sort,
         )
 
+        metric_infos = self._backend_context.compute_metric_infos_from_data_provider_session_groups(
+            self._request_context, self._experiment_id, response
+        )
+
+        all_metric_evals = self._backend_context.read_last_scalars(
+            self._request_context,
+            self._experiment_id,
+            run_tag_filter=None,
+        )
+
         session_groups = []
         for provider_group in response:
-            sessions = [
-                api_pb2.Session(name=f"{s.experiment_id}/{s.run}")
-                for s in provider_group.sessions
-            ]
-            name = (
-                f"{provider_group.root.experiment_id}/{provider_group.root.run}"
-                if provider_group.root.run
-                else provider_group.root.experiment_id
+            sessions = []
+            for session in provider_group.sessions:
+                session_name = (
+                    backend_context_lib.generate_data_provider_session_name(
+                        self._experiment_id, session
+                    )
+                )
+                sessions.append(
+                    self._build_session(
+                        metric_infos,
+                        session_name,
+                        plugin_data_pb2.SessionStartInfo(),
+                        plugin_data_pb2.SessionEndInfo(),
+                        all_metric_evals,
+                    )
+                )
+
+            name = backend_context_lib.generate_data_provider_session_name(
+                self._experiment_id, provider_group.root
             )
             session_group = api_pb2.SessionGroup(
                 name=name,
@@ -154,9 +179,16 @@ def _session_groups_from_data_provider(self):
 
             session_groups.append(session_group)
 
+        # Compute the session group's aggregated metrics for each group.
+        for group in session_groups:
+            if group.sessions:
+                self._aggregate_metrics(group)
+
         return session_groups
 
-    def _build_session_groups(self, hparams_run_to_tag_to_content, experiment):
+    def _build_session_groups(
+        self, hparams_run_to_tag_to_content, metric_infos
+    ):
         """Returns a list of SessionGroups protobuffers from the summary
         data."""
 
@@ -178,7 +210,7 @@ def _build_session_groups(self, hparams_run_to_tag_to_content, experiment):
         metric_runs = set()
         metric_tags = set()
         for session_name in session_names:
-            for metric in experiment.metric_infos:
+            for metric in metric_infos:
                 metric_name = metric.name
                 (run, tag) = metrics.run_tag_from_session_and_metric(
                     session_name, metric_name
@@ -207,7 +239,11 @@ def _build_session_groups(self, hparams_run_to_tag_to_content, experiment):
                     tag_to_content[metadata.SESSION_END_INFO_TAG]
                 )
             session = self._build_session(
-                experiment, session_name, start_info, end_info, all_metric_evals
+                metric_infos,
+                session_name,
+                start_info,
+                end_info,
+                all_metric_evals,
             )
             if session.status in self._request.allowed_statuses:
                 self._add_session(session, start_info, groups_by_name)
@@ -263,7 +299,7 @@ def _add_session(self, session, start_info, groups_by_name):
             groups_by_name[group_name] = group
 
     def _build_session(
-        self, experiment, name, start_info, end_info, all_metric_evals
+        self, metric_infos, name, start_info, end_info, all_metric_evals
     ):
         """Builds a session object."""
 
@@ -273,7 +309,7 @@ def _build_session(
             start_time_secs=start_info.start_time_secs,
             model_uri=start_info.model_uri,
             metric_values=self._build_session_metric_values(
-                experiment, name, all_metric_evals
+                metric_infos, name, all_metric_evals
             ),
             monitor_url=start_info.monitor_url,
         )
@@ -283,13 +319,13 @@ def _build_session(
         return result
 
     def _build_session_metric_values(
-        self, experiment, session_name, all_metric_evals
+        self, metric_infos, session_name, all_metric_evals
     ):
         """Builds the session metric values."""
 
         # result is a list of api_pb2.MetricValue instances.
         result = []
-        for metric_info in experiment.metric_infos:
+        for metric_info in metric_infos:
             metric_name = metric_info.name
             (run, tag) = metrics.run_tag_from_session_and_metric(
                 session_name, metric_name