[Helion Benchmark] Default to single view (#7123)

Stacked PRs:
 * #7129
 * #7128
 * #7126
 * __->__#7123
 * #7121


--- --- ---

### [Helion Benchmark] Default to single view

Author: oulgen

torchci/components/benchmark/llms/LLMsBenchmarkPage.tsx

@@ -192,6 +192,9 @@ const MainPage = ({
   const options = data;
   const dropdownMapList = getBenchmarkDropdownFeatures(options, props.repoName);
   const metricNames = getMetricNames(data);
+  // Default to latest for Helion Benchmark, otherwise default to oldest commit
+  const lcommitFallbackIdx =
+    props.benchmarkName === "Helion Benchmark" ? 0 : -1;
   return (
     <div>
       <Stack direction="row" spacing={2} sx={{ mb: 2 }}>
@@ -203,6 +206,7 @@ const MainPage = ({
         props={props}
         dispatch={dispatch}
         queryParams={queryParams}
+        lcommitFallbackIdx={lcommitFallbackIdx}
       />
       <LLMsReport
         props={props}

torchci/components/benchmark/llms/components/dashboardPicker/LLMsDashboardPicker.tsx

@@ -12,11 +12,13 @@ export const LLMsDashboardPicker = ({
   props,
   dispatch,
   queryParams,
+  lcommitFallbackIdx,
 }: {
   props: LLMsBenchmarkProps;
   options?: DropdownGroupItem[];
   dispatch: Dispatch<any>;
   queryParams: any;
+  lcommitFallbackIdx: number;
 }) => {
   if (!options) {
     return (
@@ -29,6 +31,7 @@ export const LLMsDashboardPicker = ({
   const handleChange = (key: string, newVal: any) => {
     dispatch({ type: "UPDATE_FIELD", field: key, value: newVal });
   };
+
   return (
     <div>
       <Stack direction="row" spacing={2} sx={{ mb: 2 }}>
@@ -50,7 +53,7 @@ export const LLMsDashboardPicker = ({
             dispatch({ type: "UPDATE_FIELD", field: "lCommit", value: val });
           }}
           titlePrefix={"Base"}
-          fallbackIndex={-1} // Default to oldest commit
+          fallbackIndex={lcommitFallbackIdx}
           timeRange={props.timeRange}
         />
         <Divider orientation="vertical" flexItem>