selectImage = () => {
    const options = {
      title: 'Select Image',
      storageOptions: {
        skipBackup: true,
        path: 'images',
      },
    };
    ImagePicker.showImagePicker(options, (response) => {
      console.log('Response = ', response);

      if (response.didCancel) {
        console.log('User cancelled image picker');
      } else if (response.error) {
        console.log('ImagePicker Error: ', response.error);
      } else if (response.customButton) {
        console.log('User tapped custom button: ', response.customButton);
      } else {
        const source = { uri: response.uri };
        this.setState({
          image: source,
          predictions: null
        });
        this.classifyImage()
      }
    });
  }