diff --git a/js/manager.js b/js/manager.js
index 5276798e0..ff7328a4c 100644
--- a/js/manager.js
+++ b/js/manager.js
@@ -14,7 +14,7 @@ const loadedModel = {}
 export default class AIManager {
 	constructor(setting) {
 		this._setting = setting
-		this._platform = new DefaultPlatform(null, this)
+		this._platform = new DefaultPlatform(this)
 		this._task = ''
 		this._datas = new ManualData(this)
 		this._dataset = 'manual'
@@ -98,7 +98,7 @@ export default class AIManager {
 		}
 		if (task === 'MD' || task === 'GM') {
 			return new Promise(resolve => {
-				new loadedPlatform[type](task, this, env => {
+				new loadedPlatform[type](this, env => {
 					this._platform = env
 					this._platform.init()
 					if (!this._setting.ml.modelName) env.render()
@@ -107,7 +107,7 @@ export default class AIManager {
 				})
 			})
 		}
-		this._platform = new loadedPlatform[type](task, this)
+		this._platform = new loadedPlatform[type](this)
 		if (this._requireRenderers) {
 			this._platform._renderer.push(...this._requireRenderers.map(r => new r(this)))
 		}
diff --git a/js/platform/base.js b/js/platform/base.js
index 5e2dab481..e5f0ec4c9 100644
--- a/js/platform/base.js
+++ b/js/platform/base.js
@@ -5,7 +5,7 @@ import CentroidPlotter from '../renderer/util/centroids.js'
 import TableRenderer from '../renderer/table.js'
 
 export class BasePlatform {
-	constructor(task, manager) {
+	constructor(manager) {
 		this._manager = manager
 
 		this._renderer = [new ScatterRenderer(manager)]
@@ -57,8 +57,8 @@ export class BasePlatform {
 }
 
 export class DefaultPlatform extends BasePlatform {
-	constructor(task, manager) {
-		super(task, manager)
+	constructor(manager) {
+		super(manager)
 		this._renderer.push(new TableRenderer(manager))
 
 		const elm = this.setting.task.configElement
diff --git a/js/platform/document.js b/js/platform/document.js
index 2e576b317..aa2c46974 100644
--- a/js/platform/document.js
+++ b/js/platform/document.js
@@ -3,8 +3,8 @@ import LinePlotter from '../renderer/util/lineplot.js'
 import DocumentScatterRenderer from '../renderer/document.js'
 
 export default class DocumentPlatform extends BasePlatform {
-	constructor(task, manager) {
-		super(task, manager)
+	constructor(manager) {
+		super(manager)
 		this._renderer.forEach(rend => rend.terminate())
 		this._renderer = [new DocumentScatterRenderer(manager)]
 	}
diff --git a/js/platform/image.js b/js/platform/image.js
index e7b6a7172..ccd48a88e 100644
--- a/js/platform/image.js
+++ b/js/platform/image.js
@@ -3,8 +3,8 @@ import ImageData from '../data/image.js'
 import ImageRenderer from '../renderer/image.js'
 
 export default class ImagePlatform extends BasePlatform {
-	constructor(task, manager) {
-		super(task, manager)
+	constructor(manager) {
+		super(manager)
 
 		this._reduce_algorithm = 'mean'
 		this._color_space = 'rgb'
diff --git a/js/platform/recommend.js b/js/platform/recommend.js
index 4ad75339f..ec2da1aeb 100644
--- a/js/platform/recommend.js
+++ b/js/platform/recommend.js
@@ -2,8 +2,8 @@ import { BasePlatform } from './base.js'
 import TableRenderer from '../renderer/table.js'
 
 export default class RecommendPlatform extends BasePlatform {
-	constructor(task, manager) {
-		super(task, manager)
+	constructor(manager) {
+		super(manager)
 		this._renderer.push(new TableRenderer(manager))
 		this.setting.render.selectItem('table')
 	}
diff --git a/js/platform/rl.js b/js/platform/rl.js
index b9d42191e..0911ff24c 100644
--- a/js/platform/rl.js
+++ b/js/platform/rl.js
@@ -13,8 +13,8 @@ const AIEnv = {
 }
 
 export default class RLPlatform extends BasePlatform {
-	constructor(task, manager, cb) {
-		super(task, manager)
+	constructor(manager, cb) {
+		super(manager)
 		this._type = ''
 		this._epoch = 0
 		this._env = new EmptyRLEnvironment()
diff --git a/js/platform/semisupervised.js b/js/platform/semisupervised.js
index 59154259c..a62f54b3b 100644
--- a/js/platform/semisupervised.js
+++ b/js/platform/semisupervised.js
@@ -2,8 +2,8 @@ import { DefaultPlatform } from './base.js'
 import LinePlotter from '../renderer/util/lineplot.js'
 
 export default class SemisupervisedPlatform extends DefaultPlatform {
-	constructor(task, manager) {
-		super(task, manager)
+	constructor(manager) {
+		super(manager)
 
 		const elm = this.setting.task.configElement
 		const desctxt = document.createElement('div')
diff --git a/js/platform/series.js b/js/platform/series.js
index 3f92b64f5..0c0d39c28 100644
--- a/js/platform/series.js
+++ b/js/platform/series.js
@@ -3,8 +3,8 @@ import { BasePlatform } from './base.js'
 import LinePlotter from '../renderer/util/lineplot.js'
 
 export default class SeriesPlatform extends BasePlatform {
-	constructor(task, manager) {
-		super(task, manager)
+	constructor(manager) {
+		super(manager)
 		this._renderer.forEach(rend => rend.terminate())
 		this._renderer = [new LineRenderer(manager)]
 	}