fix no log from subprocess on trial (#3653)

Co-authored-by: Hao Ni <v-nihao@microsoft.com>

ts/nni_manager/common/trainingService.ts

@@ -8,7 +8,7 @@
  */
 type TrialJobStatus = 'UNKNOWN' | 'WAITING' | 'RUNNING' | 'SUCCEEDED' | 'FAILED' | 'USER_CANCELED' | 'SYS_CANCELED' | 'EARLY_STOPPED';
 
-type LogType = 'TRIAL_LOG' | 'TRIAL_ERROR';
+type LogType = 'TRIAL_LOG' | 'TRIAL_STDOUT' | 'TRIAL_ERROR';
 
 interface TrainingServiceMetadata {
     readonly key: string;

ts/nni_manager/training_service/local/localTrainingService.ts

@@ -174,6 +174,8 @@ class LocalTrainingService implements TrainingService {
         let logPath: string;
         if (logType === 'TRIAL_LOG') {
             logPath = path.join(this.rootDir, 'trials', trialJobId, 'trial.log');
+        } else if (logType === 'TRIAL_STDOUT'){
+            logPath = path.join(this.rootDir, 'trials', trialJobId, 'stdout');
         } else if (logType === 'TRIAL_ERROR') {
             logPath = path.join(this.rootDir, 'trials', trialJobId, 'stderr');
         } else {
@@ -412,15 +414,16 @@ class LocalTrainingService implements TrainingService {
     private getScript(workingDirectory: string): string[] {
         const script: string[] = [];
         if (process.platform === 'win32') {
+            script.push(`$PSDefaultParameterValues = @{'Out-File:Encoding' = 'utf8'}`);
             script.push(`cd $env:NNI_CODE_DIR`);
             script.push(
-                `cmd.exe /c ${this.config.trialCommand} 2>&1 | Out-File "${path.join(workingDirectory, 'stderr')}" -encoding utf8`,
+                `cmd.exe /c ${this.config.trialCommand} 1>${path.join(workingDirectory, 'stdout')} 2>${path.join(workingDirectory, 'stderr')}`,
                 `$NOW_DATE = [int64](([datetime]::UtcNow)-(get-date "1/1/1970")).TotalSeconds`,
                 `$NOW_DATE = "$NOW_DATE" + (Get-Date -Format fff).ToString()`,
                 `Write $LASTEXITCODE " " $NOW_DATE  | Out-File "${path.join(workingDirectory, '.nni', 'state')}" -NoNewline -encoding utf8`);
         } else {
             script.push(`cd $NNI_CODE_DIR`);
-            script.push(`eval ${this.config.trialCommand} 2>"${path.join(workingDirectory, 'stderr')}"`);
+            script.push(`eval ${this.config.trialCommand} 1>${path.join(workingDirectory, 'stdout')} 2>${path.join(workingDirectory, 'stderr')}`);
             if (process.platform === 'darwin') {
                 // https://superuser.com/questions/599072/how-to-get-bash-execution-time-in-milliseconds-under-mac-os-x
                 // Considering the worst case, write 999 to avoid negative duration