main.js

/**
 * @license
 * Copyright 2018 Reiichiro Nakano All Rights Reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * =============================================================================
 */

import 'babel-polyfill';
import * as tf from '@tensorflow/tfjs';
import links from './links';

/**
 * Main application to start on window load
 */
class Main {
  constructor() {
    if (window.mobilecheck()) {
      document.getElementById('mobile-warning').hidden = false;
    }

    this.fileSelect = document.getElementById('file-select');

    // Initialize model selection
    this.modelSelectStyle = document.getElementById('model-select-style');
    this.modelSelectStyle.onchange = (evt) => {
      if (evt.target.value === 'mobilenet') {
        this.disableStylizeButtons();
        this.loadMobileNetStyleModel().then(model => {
          this.styleNet = model;
        }).finally(() => this.enableStylizeButtons());
      } else if (evt.target.value === 'inception') {
        this.disableStylizeButtons();
        this.loadInceptionStyleModel().then(model => {
          this.styleNet = model;
        }).finally(() => this.enableStylizeButtons());
      }
    }

    this.modelSelectTransformer = document.getElementById('model-select-transformer');
    this.modelSelectTransformer.onchange = (evt) => {
      if (evt.target.value === 'original') {
        this.disableStylizeButtons();
        this.loadOriginalTransformerModel().then(model => {
          this.transformNet = model;
        }).finally(() => this.enableStylizeButtons());
      } else if (evt.target.value === 'separable') {
        this.disableStylizeButtons();
        this.loadSeparableTransformerModel().then(model => {
          this.transformNet = model;
        }).finally(() => this.enableStylizeButtons());
      }
    }

    this.initalizeWebcamVariables();
    this.initializeStyleTransfer();
    this.initializeCombineStyles();

    Promise.all([
      this.loadMobileNetStyleModel(),
      this.loadSeparableTransformerModel(),
    ]).then(([styleNet, transformNet]) => {
      console.log('Loaded styleNet');
      this.styleNet = styleNet;
      this.transformNet = transformNet;
      this.enableStylizeButtons()
    });
  }

  async loadMobileNetStyleModel() {
    if (!this.mobileStyleNet) {
      this.mobileStyleNet = await tf.loadFrozenModel(
        'saved_model_style_js/tensorflowjs_model.pb', 
        'saved_model_style_js/weights_manifest.json');
    }

    return this.mobileStyleNet;
  }

  async loadInceptionStyleModel() {
    if (!this.inceptionStyleNet) {
      this.inceptionStyleNet = await tf.loadFrozenModel(
        'saved_model_style_inception_js/tensorflowjs_model.pb',
        'saved_model_style_inception_js/weights_manifest.json');
    }
    
    return this.inceptionStyleNet;
  }

  async loadOriginalTransformerModel() {
    if (!this.originalTransformNet) {
      this.originalTransformNet = await tf.loadFrozenModel(
        'saved_model_transformer_js/tensorflowjs_model.pb',
        'saved_model_transformer_js/weights_manifest.json'
      );
    }

    return this.originalTransformNet;
  }

  async loadSeparableTransformerModel() {
    if (!this.separableTransformNet) {
      this.separableTransformNet = await tf.loadFrozenModel(
        'saved_model_transformer_separable_js/tensorflowjs_model.pb',
        'saved_model_transformer_separable_js/weights_manifest.json'
      );
    }

    return this.separableTransformNet;
  }

  initalizeWebcamVariables() {
    this.camModal = $('#cam-modal');

    this.snapButton = document.getElementById('snap-button');
    this.webcamVideoElement = document.getElementById('webcam-video');

    navigator.getUserMedia = navigator.getUserMedia ||
        navigator.webkitGetUserMedia || navigator.mozGetUserMedia ||
        navigator.msGetUserMedia;

    this.camModal.on('hidden.bs.modal', () => {
      this.stream.getTracks()[0].stop();
    })

    this.camModal.on('shown.bs.modal', () => {
      navigator.getUserMedia(
        {
          video: true
        },
        (stream) => {
          this.stream = stream;
          this.webcamVideoElement.srcObject = stream;
          this.webcamVideoElement.play();
        },
        (err) => {
          console.error(err);
        }
      );
    })
  }

  openModal(element) {
    this.camModal.modal('show');
    this.snapButton.onclick = () => {
      const hiddenCanvas = document.getElementById('hidden-canvas');
      const hiddenContext = hiddenCanvas.getContext('2d');
      hiddenCanvas.width = this.webcamVideoElement.width;
      hiddenCanvas.height = this.webcamVideoElement.height;
      hiddenContext.drawImage(this.webcamVideoElement, 0, 0, 
        hiddenCanvas.width, hiddenCanvas.height);
      const imageDataURL = hiddenCanvas.toDataURL('image/jpg');
      element.src = imageDataURL;
      this.camModal.modal('hide');
    };
  }

  initializeStyleTransfer() {
    // Initialize images
    this.contentImg = document.getElementById('content-img');
    this.contentImg.onerror = () => {
      alert("Error loading " + this.contentImg.src + ".");
    }
    this.styleImg = document.getElementById('style-img');
    this.styleImg.onerror = () => {
      alert("Error loading " + this.styleImg.src + ".");
    }
    this.stylized = document.getElementById('stylized');

    // Initialize images
    this.contentImgSlider = document.getElementById('content-img-size');
    this.connectImageAndSizeSlider(this.contentImg, this.contentImgSlider);
    this.styleImgSlider = document.getElementById('style-img-size');
    this.styleImgSquare = document.getElementById('style-img-square');
    this.connectImageAndSizeSlider(this.styleImg, this.styleImgSlider, this.styleImgSquare);
    
    this.styleRatio = 1.0
    this.styleRatioSlider = document.getElementById('stylized-img-ratio');
    this.styleRatioSlider.oninput = (evt) => {
      this.styleRatio = evt.target.value/100.;
    }

    // Initialize buttons
    this.styleButton = document.getElementById('style-button');
    this.styleButton.onclick = () => {
      this.disableStylizeButtons();
      this.startStyling().finally(() => {
        this.enableStylizeButtons();
      });
    };
    this.randomizeButton = document.getElementById('randomize');
    this.randomizeButton.onclick = () => {
      this.styleRatioSlider.value = getRndInteger(0, 100);
      this.contentImgSlider.value = getRndInteger(256, 400);
      this.styleImgSlider.value = getRndInteger(100, 400);
      this.styleRatioSlider.dispatchEvent(new Event("input"));
      this.contentImgSlider.dispatchEvent(new Event("input"));
      this.styleImgSlider.dispatchEvent(new Event("input"));
      if (getRndInteger(0, 1)) {
        this.styleImgSquare.click();
      }
    }

    // Initialize selectors
    this.contentSelect = document.getElementById('content-select');
    this.contentSelect.onchange = (evt) => this.setImage(this.contentImg, evt.target.value);
    this.contentSelect.onclick = () => this.contentSelect.value = '';
    this.styleSelect = document.getElementById('style-select');
    this.styleSelect.onchange = (evt) => this.setImage(this.styleImg, evt.target.value);
    this.styleSelect.onclick = () => this.styleSelect.value = '';
  }

  initializeCombineStyles() {
    // Initialize images
    this.combContentImg = document.getElementById('c-content-img');
    this.combContentImg.onerror = () => {
      alert("Error loading " + this.combContentImg.src + ".");
    }
    this.combStyleImg1 = document.getElementById('c-style-img-1');
    this.combStyleImg1.onerror = () => {
      alert("Error loading " + this.combStyleImg1.src + ".");
    }
    this.combStyleImg2 = document.getElementById('c-style-img-2');
    this.combStyleImg2.onerror = () => {
      alert("Error loading " + this.combStyleImg2.src + ".");
    }
    this.combStylized = document.getElementById('c-stylized');

    // Initialize images
    this.combContentImgSlider = document.getElementById('c-content-img-size');
    this.connectImageAndSizeSlider(this.combContentImg, this.combContentImgSlider);
    this.combStyleImg1Slider = document.getElementById('c-style-img-1-size');
    this.combStyleImg1Square = document.getElementById('c-style-1-square');
    this.connectImageAndSizeSlider(this.combStyleImg1, this.combStyleImg1Slider, this.combStyleImg1Square);
    this.combStyleImg2Slider = document.getElementById('c-style-img-2-size');
    this.combStyleImg2Square = document.getElementById('c-style-2-square');
    this.connectImageAndSizeSlider(this.combStyleImg2, this.combStyleImg2Slider, this.combStyleImg2Square);

    this.combStyleRatio = 0.5
    this.combStyleRatioSlider = document.getElementById('c-stylized-img-ratio');
    this.combStyleRatioSlider.oninput = (evt) => {
      this.combStyleRatio = evt.target.value/100.;
    }

    // Initialize buttons
    this.combineButton = document.getElementById('combine-button');
    this.combineButton.onclick = () => {
      this.disableStylizeButtons();
      this.startCombining().finally(() => {
        this.enableStylizeButtons();
      });
    };
    this.combRandomizeButton = document.getElementById('c-randomize');
    this.combRandomizeButton.onclick = () => {
      this.combContentImgSlider.value = getRndInteger(256, 400);
      this.combStyleImg1Slider.value = getRndInteger(100, 400);
      this.combStyleImg2Slider.value = getRndInteger(100, 400);
      this.combStyleRatioSlider.value = getRndInteger(0, 100);
      this.combContentImgSlider.dispatchEvent(new Event("input"));
      this.combStyleImg1Slider.dispatchEvent(new Event("input"));
      this.combStyleImg2Slider.dispatchEvent(new Event("input"));
      this.combStyleRatioSlider.dispatchEvent(new Event("input"));
      if (getRndInteger(0, 1)) {
        this.combStyleImg1Square.click();
      }
      if (getRndInteger(0, 1)) {
        this.combStyleImg2Square.click();
      }
    }

    // Initialize selectors
    this.combContentSelect = document.getElementById('c-content-select');
    this.combContentSelect.onchange = (evt) => this.setImage(this.combContentImg, evt.target.value);
    this.combContentSelect.onclick = () => this.combContentSelect.value = '';
    this.combStyle1Select = document.getElementById('c-style-1-select');
    this.combStyle1Select.onchange = (evt) => this.setImage(this.combStyleImg1, evt.target.value);
    this.combStyle1Select.onclick = () => this.combStyle1Select.value = '';
    this.combStyle2Select = document.getElementById('c-style-2-select');
    this.combStyle2Select.onchange = (evt) => this.setImage(this.combStyleImg2, evt.target.value);
    this.combStyle2Select.onclick = () => this.combStyle2Select.value = '';
  }

  connectImageAndSizeSlider(img, slider, square) {
    slider.oninput = (evt) => {
      img.height = evt.target.value;
      if (img.style.width) {
        // If this branch is triggered, then that means the image was forced to a square using
        // a fixed pixel value.
        img.style.width = img.height+"px";  // Fix width back to a square
      }
    }
    if (square !== undefined) {
      square.onclick = (evt) => {
        if (evt.target.checked) {
          img.style.width = img.height+"px";
        } else {
          img.style.width = '';
        }
      }
    }
  }

  // Helper function for setting an image
  setImage(element, selectedValue) {
    if (selectedValue === 'file') {
      console.log('file selected');
      this.fileSelect.onchange = (evt) => {
        const f = evt.target.files[0];
        const fileReader = new FileReader();
        fileReader.onload = ((e) => {
          element.src = e.target.result;
        });
        fileReader.readAsDataURL(f);
        this.fileSelect.value = '';
      }
      this.fileSelect.click();
    } else if (selectedValue === 'pic') {
      this.openModal(element);
    } else if (selectedValue === 'random') {
      const randomNumber = Math.floor(Math.random()*links.length);
      element.src = links[randomNumber];
    } else {
      element.src = 'images/' + selectedValue + '.jpg';
    }
  }

  enableStylizeButtons() {
    this.styleButton.disabled = false;
    this.combineButton.disabled = false;
    this.modelSelectStyle.disabled = false;
    this.modelSelectTransformer.disabled = false;
    this.styleButton.textContent = 'Stylize';
    this.combineButton.textContent = 'Combine Styles';
  }

  disableStylizeButtons() {
    this.styleButton.disabled = true;
    this.combineButton.disabled = true;
    this.modelSelectStyle.disabled = true;
    this.modelSelectTransformer.disabled = true;
  }

  async startStyling() {
    await tf.nextFrame();
    this.styleButton.textContent = 'Generating 100D style representation';
    await tf.nextFrame();
    let bottleneck = await tf.tidy(() => {
      return this.styleNet.predict(tf.fromPixels(this.styleImg).toFloat().div(tf.scalar(255)).expandDims());
    })
    if (this.styleRatio !== 1.0) {
      this.styleButton.textContent = 'Generating 100D identity style representation';
      await tf.nextFrame();
      const identityBottleneck = await tf.tidy(() => {
        return this.styleNet.predict(tf.fromPixels(this.contentImg).toFloat().div(tf.scalar(255)).expandDims());
      })
      const styleBottleneck = bottleneck;
      bottleneck = await tf.tidy(() => {
        const styleBottleneckScaled = styleBottleneck.mul(tf.scalar(this.styleRatio));
        const identityBottleneckScaled = identityBottleneck.mul(tf.scalar(1.0-this.styleRatio));
        return styleBottleneckScaled.addStrict(identityBottleneckScaled)
      })
      styleBottleneck.dispose();
      identityBottleneck.dispose();
    }
    this.styleButton.textContent = 'Stylizing image...';
    await tf.nextFrame();
    const stylized = await tf.tidy(() => {
      return this.transformNet.predict([tf.fromPixels(this.contentImg).toFloat().div(tf.scalar(255)).expandDims(), bottleneck]).squeeze();
    })
    await tf.toPixels(stylized, this.stylized);
    bottleneck.dispose();  // Might wanna keep this around
    stylized.dispose();
  }

  async startCombining() {
    await tf.nextFrame();
    this.combineButton.textContent = 'Generating 100D style representation of image 1';
    await tf.nextFrame();
    const bottleneck1 = await tf.tidy(() => {
      return this.styleNet.predict(tf.fromPixels(this.combStyleImg1).toFloat().div(tf.scalar(255)).expandDims());
    })
    
    this.combineButton.textContent = 'Generating 100D style representation of image 2';
    await tf.nextFrame();
    const bottleneck2 = await tf.tidy(() => {
      return this.styleNet.predict(tf.fromPixels(this.combStyleImg2).toFloat().div(tf.scalar(255)).expandDims());
    });

    this.combineButton.textContent = 'Stylizing image...';
    await tf.nextFrame();
    const combinedBottleneck = await tf.tidy(() => {
      const scaledBottleneck1 = bottleneck1.mul(tf.scalar(1-this.combStyleRatio));
      const scaledBottleneck2 = bottleneck2.mul(tf.scalar(this.combStyleRatio));
      return scaledBottleneck1.addStrict(scaledBottleneck2);
    });

    const stylized = await tf.tidy(() => {
      return this.transformNet.predict([tf.fromPixels(this.combContentImg).toFloat().div(tf.scalar(255)).expandDims(), combinedBottleneck]).squeeze();
    })
    await tf.toPixels(stylized, this.combStylized);
    bottleneck1.dispose();  // Might wanna keep this around
    bottleneck2.dispose();
    combinedBottleneck.dispose();
    stylized.dispose();
  }

  async benchmark() {
    const x = tf.randomNormal([1, 256, 256, 3]);
    const bottleneck = tf.randomNormal([1, 1, 1, 100]);

    let styleNet = await this.loadInceptionStyleModel();
    let time = await this.benchmarkStyle(x, styleNet);
    styleNet.dispose();

    styleNet = await this.loadMobileNetStyleModel();
    time = await this.benchmarkStyle(x, styleNet);
    styleNet.dispose();

    let transformNet = await this.loadOriginalTransformerModel();
    time = await this.benchmarkTransform(
        x, bottleneck, transformNet);
    transformNet.dispose();

    transformNet = await this.loadSeparableTransformerModel();
    time = await this.benchmarkTransform(
      x, bottleneck, transformNet);
    transformNet.dispose();

    x.dispose();
    bottleneck.dispose();
  }

  async benchmarkStyle(x, styleNet) {
    const profile = await tf.profile(() => {
      tf.tidy(() => {
        const dummyOut = styleNet.predict(x);
        dummyOut.print();
      });
    });
    console.log(profile);
    const time = await tf.time(() => {
      tf.tidy(() => {
        for (let i = 0; i < 10; i++) {
          const y = styleNet.predict(x);
          y.print();
        }
      })
    });
    console.log(time);
  }

  async benchmarkTransform(x, bottleneck, transformNet) {
    const profile = await tf.profile(() => {
      tf.tidy(() => {
        const dummyOut = transformNet.predict([x, bottleneck]);
        dummyOut.print();
      });
    });
    console.log(profile);
    const time = await tf.time(() => {
      tf.tidy(() => {
        for (let i = 0; i < 10; i++) {
          const y = transformNet.predict([x, bottleneck]);
          y.print();
        }
      })
    });
    console.log(time);
  }
}

function getRndInteger(min, max) {
  return Math.floor(Math.random() * (max - min + 1) ) + min;
}

window.mobilecheck = function() {
  var check = false;
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  return check;
};
window.addEventListener('load', () => new Main());