Fix OpenPAI training service failed issue after multiphase training code merged (#206)

* fix parameter file name issue for multi-phase training

* Updated based on comments

examples/assessors/README.md

@@ -2,10 +2,10 @@
 
 *Assessor receive intermediate result from Trial and decide whether the Trial should be killed. Once the Trial experiment meets the early stop conditions, the assessor will kill the Trial.*
 
-So, if user want to implement a customized Assessor, she/he only need to:
+So, if users want to implement a customized Assessor, they only need to:
 
 
-**1) Inherit a tuner of a base Tuner class**
+**1) Inherit an assessor of a base Assessor class**
 ```python
 from nni.assessor import Assessor
 
@@ -31,7 +31,7 @@ class CustomizedAssessor(Assessor):
         # you code implement here.
         ...
 ```
-**3) Write a script to run Tuner**
+**3) Write a script to run Assessor**
 ```python
 import argparse
 

src/nni_manager/common/utils.ts

@@ -31,7 +31,7 @@ import * as util from 'util';
 import { Database, DataStore } from './datastore';
 import { ExperimentStartupInfo, getExperimentId, setExperimentStartupInfo } from './experimentStartupInfo';
 import { Manager } from './manager';
-import { TrainingService } from './trainingService';
+import { HyperParameters, TrainingService } from './trainingService';
 
 function getExperimentRootDir(): string {
     return path.join(os.homedir(), 'nni', 'experiments', getExperimentId());
@@ -194,6 +194,23 @@ function getMsgDispatcherCommand(tuner: any, assessor: any, multiPhase: boolean
     return command;
 }
 
+/**
+ * Generate parameter file name based on HyperParameters object
+ * @param hyperParameters HyperParameters instance
+ */
+function generateParamFileName(hyperParameters : HyperParameters): string {
+    assert(hyperParameters !== undefined);
+    assert(hyperParameters.index >= 0);
+
+    let paramFileName : string;
+    if(hyperParameters.index == 0) {
+        paramFileName = 'parameter.cfg';
+    } else {
+        paramFileName = `parameter_${hyperParameters.index}.cfg`
+    }
+    return paramFileName;
+}
+
 /**
  * Initialize a pseudo experiment environment for unit test.
  * Must be paired with `cleanupUnitTest()`.
@@ -242,5 +259,5 @@ function getIPV4Address(): string {
     return ipv4Address;
 }
 
-export { getMsgDispatcherCommand, getLogDir, getExperimentRootDir, getDefaultDatabaseDir, getIPV4Address, 
-    mkDirP, delay, prepareUnitTest, parseArg, cleanupUnitTest, uniqueString, randomSelect };
+export { generateParamFileName, getMsgDispatcherCommand, getLogDir, getExperimentRootDir, 
+    getDefaultDatabaseDir, getIPV4Address, mkDirP, delay, prepareUnitTest, parseArg, cleanupUnitTest, uniqueString, randomSelect };

src/nni_manager/training_service/local/localTrainingService.ts

@@ -33,7 +33,7 @@ import {
     HostJobApplicationForm, JobApplicationForm, HyperParameters, TrainingService, TrialJobApplicationForm,
     TrialJobDetail, TrialJobMetric, TrialJobStatus
 } from '../../common/trainingService';
-import { delay, getExperimentRootDir, uniqueString } from '../../common/utils';
+import { delay, generateParamFileName, getExperimentRootDir, uniqueString } from '../../common/utils';
 import { file } from 'tmp';
 
 const tkill = require('tree-kill');
@@ -412,7 +412,7 @@ class LocalTrainingService implements TrainingService {
     }
 
     private async writeParameterFile(directory: string, hyperParameters: HyperParameters): Promise<void> {
-        const filepath: string = path.join(directory, `parameter_${hyperParameters.index}.cfg`);
+        const filepath: string = path.join(directory, generateParamFileName(hyperParameters));
         await fs.promises.writeFile(filepath, hyperParameters.value, { encoding: 'utf8' });
     }
 }

src/nni_manager/training_service/pai/paiTrainingService.ts

@@ -20,6 +20,7 @@
 
 'use strict'
 
+import * as assert from 'assert';
 import * as component from '../../common/component';
 import * as cpp from 'child-process-promise';
 import * as fs from 'fs';
@@ -37,7 +38,7 @@ import {
     JobApplicationForm, TrainingService, TrialJobApplicationForm,
     TrialJobDetail, TrialJobMetric
 } from '../../common/trainingService';
-import { delay, getExperimentRootDir, getIPV4Address, uniqueString } from '../../common/utils';
+import { delay, generateParamFileName, getExperimentRootDir, getIPV4Address, uniqueString } from '../../common/utils';
 import { PAIJobRestServer } from './paiJobRestServer'
 import { PAITrialJobDetail, PAI_INSTALL_NNI_SHELL_FORMAT, PAI_TRIAL_COMMAND_FORMAT, PAI_OUTPUT_DIR_FORMAT, PAI_LOG_PATH_FORMAT } from './paiData';
 import { PAIJobInfoCollector } from './paiJobInfoCollector';
@@ -160,7 +161,8 @@ class PAITrainingService implements TrainingService {
         // Write file content ( parameter.cfg ) to local tmp folders
         const trialForm : TrialJobApplicationForm = (<TrialJobApplicationForm>form)
         if(trialForm) {
-            await fs.promises.writeFile(path.join(trialLocalTempFolder, 'parameter.cfg'), trialForm.hyperParameters, { encoding: 'utf8' });
+            await fs.promises.writeFile(path.join(trialLocalTempFolder, generateParamFileName(trialForm.hyperParameters)), 
+                            trialForm.hyperParameters.value, { encoding: 'utf8' });
         }
         
         // Step 1. Prepare PAI job configuration

src/nni_manager/training_service/remote_machine/remoteMachineTrainingService.ts

@@ -36,7 +36,7 @@ import { ObservableTimer } from '../../common/observableTimer';
 import {
     HostJobApplicationForm, HyperParameters, JobApplicationForm, TrainingService, TrialJobApplicationForm, TrialJobDetail, TrialJobMetric
 } from '../../common/trainingService';
-import { delay, getExperimentRootDir, uniqueString } from '../../common/utils';
+import { delay, generateParamFileName, getExperimentRootDir, uniqueString } from '../../common/utils';
 import { GPUSummary } from '../common/gpuData';
 import { TrialConfig } from '../common/trialConfig';
 import { TrialConfigMetadataKey } from '../common/trialConfigMetadataKey';
@@ -458,7 +458,7 @@ class RemoteMachineTrainingService implements TrainingService {
         //create tmp trial working folder locally.
         await cpp.exec(`mkdir -p ${trialLocalTempFolder}`);
 
-        // Write file content ( run.sh and parameter_0.cfg ) to local tmp files
+        // Write file content ( run.sh and parameter.cfg ) to local tmp files
         await fs.promises.writeFile(path.join(trialLocalTempFolder, 'run.sh'), runScriptContent, { encoding: 'utf8' });
 
         // Copy local tmp files to remote machine
@@ -586,7 +586,7 @@ class RemoteMachineTrainingService implements TrainingService {
         const trialWorkingFolder: string = path.join(this.remoteExpRootDir, 'trials', trialJobId);
         const trialLocalTempFolder: string = path.join(this.expRootDir, 'trials-local', trialJobId);
 
-        const fileName: string = `parameter_${hyperParameters.index}.cfg`;
+        const fileName: string = generateParamFileName(hyperParameters);
         const localFilepath: string = path.join(trialLocalTempFolder, fileName);
         await fs.promises.writeFile(localFilepath, hyperParameters.value, { encoding: 'utf8' });
 

src/sdk/pynni/nni/platform/local.py

@@ -49,7 +49,7 @@ def request_next_parameter():
 
 def get_parameters():
     global _param_index
-    params_filepath = os.path.join(_sysdir, 'parameter_{}.cfg'.format(_param_index))
+    params_filepath = os.path.join(_sysdir, ('parameter_{}.cfg'.format(_param_index), 'parameter.cfg')[_param_index == 0])
     if not os.path.isfile(params_filepath):
         request_next_parameter()
     while not os.path.isfile(params_filepath):