init server + train and test data split

tools/train/faceExpressions/public/js/fetchData.js

+export function getImageUrl({ db, img }) {
+  if (db === 'kaggle') {
+    return `kaggle-face-expressions-db/${label}/${id}.png`
+  }
+
+  const dirNr = Math.floor(id / NUM_IMAGES_PER_DIR)
+  return `cropped-faces/jpgs${dirNr + 1}/${id}.jpg`
+}
\ No newline at end of file

tools/train/faceExpressions/server.js

+require('./.env')
+
+const express = require('express')
+const path = require('path')
+const fs = require('fs')
+
+const app = express()
+
+const publicDir = path.join(__dirname, './public')
+app.use(express.static(publicDir))
+app.use(express.static(path.join(__dirname, '../shared')))
+app.use(express.static(path.join(__dirname, '../node_modules/file-saver')))
+app.use(express.static(path.join(__dirname, '../../../examples/public')))
+app.use(express.static(path.join(__dirname, '../../../weights')))
+app.use(express.static(path.join(__dirname, '../../../dist')))
+app.use(express.static(path.resolve(process.env.DATA_PATH)))
\ No newline at end of file

tools/train/faceExpressions/splitDataSet.js

+const dataDistribution = {
+  angry: {
+    db: 1147,
+    kaggle: 4953
+  },
+  disgusted: {
+    db: 690,
+    kaggle: 547
+  },
+  fearful: {
+    db: 844,
+    kaggle: 5121
+  },
+  happy: {
+    db: 8634,
+    kaggle: 8989
+  },
+  neutral: {
+    db: 1262,
+    kaggle: 6198
+  },
+  sad: {
+    db: 929,
+    kaggle: 6077
+  },
+  surprised: {
+    db: 1264,
+    kaggle: 4002
+  }
+}
+
+const MAX_TRAIN_SAMPLES_PER_CLASS = 2000
+
+require('./.env')
+const { shuffleArray } = require('../../../')
+const fs = require('fs')
+
+const createImageNameArray = (db, num, ext) =>
+  Array(num).fill(0)
+    .map((_, i) => `${i}${ext}`)
+    .map(img => ({ db, img }))
+
+const splitArray = (arr, idx) => [arr.slice(0, idx), arr.slice(idx)]
+
+const trainData = {}
+const testData = {}
+
+Object.keys(dataDistribution)
+  .forEach(label => {
+    const { db, kaggle } = dataDistribution[label]
+
+    // take max 0.7 percent of db, take rest from kaggle db
+    const numDb = Math.floor(Math.min(0.7 * MAX_TRAIN_SAMPLES_PER_CLASS, 0.7 * db))
+    const numKaggle = Math.floor(Math.min(MAX_TRAIN_SAMPLES_PER_CLASS - numDb, 0.7 * kaggle))
+
+    const dbImages = shuffleArray(createImageNameArray('db', db, '.jpg'))
+    const kaggleImages = shuffleArray(createImageNameArray('kaggle', kaggle, '.png'))
+
+    const [dbTrain, dbTest] = splitArray(dbImages, numDb)
+    const [kaggleTrain, kaggleTest] = splitArray(kaggleImages, numKaggle)
+
+    console.log()
+    console.log('%s:', label)
+    console.log('train data - db: %s, kaggle: %s', dbTrain.length, kaggleTrain.length)
+    console.log('test data - db: %s, kaggle: %s', dbTest.length, kaggleTest.length)
+
+    trainData[label] = dbTrain.concat(kaggleTrain)
+    testData[label] = dbTest.concat(kaggleTest)
+  })
+
+fs.writeFileSync('trainData.json', JSON.stringify(trainData))
+fs.writeFileSync('testData.json', JSON.stringify(testData))
+
+