HParams: Stop fetching hparams data using run effects (#6561)

## Motivation for features / changes
Now that we are fetching the hparams data using the newly created
hparams_effects (#6540) we no longer need to fetch them using the old
method.

Note that the experiment list SHOULD still use the old method.

tensorboard/webapp/app_routing/types.ts

@@ -38,6 +38,21 @@ export enum RouteKind {
   NOT_SET,
 }
 
+export type DashboardRoute =
+  | RouteKind.EXPERIMENT
+  | RouteKind.COMPARE_EXPERIMENT
+  | RouteKind.CARD;
+
+export function isDashboardRoute(
+  routeKind: RouteKind
+): routeKind is DashboardRoute {
+  return (
+    routeKind === RouteKind.EXPERIMENT ||
+    routeKind === RouteKind.COMPARE_EXPERIMENT ||
+    routeKind === RouteKind.CARD
+  );
+}
+
 export const DEFAULT_EXPERIMENT_ID = 'defaultExperimentId';
 
 /**

tensorboard/webapp/runs/effects/runs_effects.ts

@@ -15,24 +15,27 @@ limitations under the License.
 import {Injectable} from '@angular/core';
 import {Actions, createEffect, ofType} from '@ngrx/effects';
 import {Store} from '@ngrx/store';
-import {forkJoin, merge, Observable, of, throwError} from 'rxjs';
+import {forkJoin, merge, Observable, of, throwError, zip} from 'rxjs';
 import {
   catchError,
   distinctUntilChanged,
   filter,
   map,
   mergeMap,
+  switchMap,
   take,
   tap,
   withLatestFrom,
 } from 'rxjs/operators';
 import {areSameRouteKindAndExperiments} from '../../app_routing';
 import {navigated} from '../../app_routing/actions';
-import {RouteKind} from '../../app_routing/types';
+import {RouteKind, isDashboardRoute} from '../../app_routing/types';
 import {State} from '../../app_state';
 import * as coreActions from '../../core/actions';
 import {
   getActiveRoute,
+  getRouteKind,
+  getEnableHparamsInTimeSeries,
   getExperimentIdsFromRoute,
   getRuns,
   getRunsLoadState,
@@ -264,15 +267,33 @@ export class RunsEffects {
     );
   }
 
+  private maybeFetchHparamsMetadata(
+    experimentId: string
+  ): Observable<HparamsAndMetadata> {
+    return this.store.select(getEnableHparamsInTimeSeries).pipe(
+      withLatestFrom(this.store.select(getRouteKind)),
+      switchMap(([hparamsInTimeSeries, routeKind]) => {
+        if (hparamsInTimeSeries && isDashboardRoute(routeKind)) {
+          return of({
+            hparamSpecs: [],
+            metricSpecs: [],
+            runToHparamsAndMetrics: {},
+          });
+        }
+        return this.runsDataSource.fetchHparamsMetadata(experimentId);
+      })
+    );
+  }
+
   private fetchRunsForExperiment(experimentId: string): Observable<{
     fromRemote: true;
     experimentId: string;
     runs: Run[];
     metadata: HparamsAndMetadata;
   }> {
-    return forkJoin([
+    return zip([
       this.runsDataSource.fetchRuns(experimentId),
-      this.runsDataSource.fetchHparamsMetadata(experimentId),
+      this.maybeFetchHparamsMetadata(experimentId),
     ]).pipe(
       map(([runs, metadata]) => {
         return {fromRemote: true, experimentId, runs, metadata};

tensorboard/webapp/runs/effects/runs_effects_test.ts

@@ -28,7 +28,9 @@ import {State} from '../../app_state';
 import * as coreActions from '../../core/actions';
 import {
   getActiveRoute,
+  getEnableHparamsInTimeSeries,
   getExperimentIdsFromRoute,
+  getRouteKind,
   getRuns,
   getRunsLoadState,
 } from '../../selectors';
@@ -62,6 +64,7 @@ describe('runs_effects', () => {
   let dispatchSpy: jasmine.Spy;
   let actualActions: Action[];
   let selectSpy: jasmine.Spy;
+  let fetchHparamsSpy: jasmine.Spy;
 
   function flushFetchRuns(requestIndex: number, runs: Run[]) {
     expect(fetchRunsSubjects.length).toBeGreaterThan(requestIndex);
@@ -113,7 +116,8 @@ describe('runs_effects', () => {
     });
 
     fetchHparamsMetadataSubjects = [];
-    spyOn(runsDataSource, 'fetchHparamsMetadata').and.callFake(() => {
+    fetchHparamsSpy = spyOn(runsDataSource, 'fetchHparamsMetadata');
+    fetchHparamsSpy.and.callFake(() => {
       const subject = new ReplaySubject<HparamsAndMetadata>(1);
       fetchHparamsMetadataSubjects.push(subject);
       return subject;
@@ -231,6 +235,15 @@ describe('runs_effects', () => {
       });
     });
 
+    it('does not fetch hparam data when enableHparamsInTimeSeries is true when on a dashboard route', () => {
+      store.overrideSelector(getEnableHparamsInTimeSeries, true);
+      store.overrideSelector(getRouteKind, RouteKind.EXPERIMENT);
+      store.refreshState();
+
+      action.next(actions.runTableShown({experimentIds: ['a']}));
+      expect(fetchHparamsSpy).not.toHaveBeenCalled();
+    });
+
     it('fires FAILED action when failed to fetch runs', () => {
       action.next(actions.runTableShown({experimentIds: ['a']}));
       const expectedExperimentId = 'a';