Capstone project
<title>Next Word Prediction App</title> <script type="text/javascript"> var SLIDE_CONFIG = { // Slide settings settings: { title: 'Next Word Prediction App', useBuilds: true, usePrettify: true, enableSlideAreas: true, enableTouch: true, }, // Author information presenters: [ { name: 'Amber Wang' , company: '', gplus: '', twitter: '', www: '', github: '' }, ] }; </script> <script src="data:application/x-javascript;base64,/* Modernizr 2.5.3 (Custom Build) | MIT & BSD
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        var vendors = ['webkit','moz','ms','o',''];
        var css_props = {
            "userSelect": "none",
            "touchCallout": "none",
            "userDrag": "none",
            "tapHighlightColor": "rgba(0,0,0,0)"
        };

        var prop = '';
        for(var i = 0; i < vendors.length; i++) {
            for(var p in css_props) {
                prop = p;
                if(vendors[i]) {
                    prop = vendors[i] + prop.substring(0, 1).toUpperCase() + prop.substring(1);
                }
                element.style[ prop ] = css_props[p];
            }
        }
    })();

    // holds the distance that has been moved
    var _distance = 0;

    // holds the exact angle that has been moved
    var _angle = 0;

    // holds the diraction that has been moved
    var _direction = 0;

    // holds position movement for sliding
    var _pos = { };

    // how many fingers are on the screen
    var _fingers = 0;

    var _first = false;

    var _gesture = null;
    var _prev_gesture = null;

    var _touch_start_time = null;
    var _prev_tap_pos = {x: 0, y: 0};
    var _prev_tap_end_time = null;

    var _hold_timer = null;

    var _offset = {};

    // keep track of the mouse status
    var _mousedown = false;

    var _event_start;
    var _event_move;
    var _event_end;


    /**
     * angle to direction define
     * @param  float    angle
     * @return string   direction
     */
    this.getDirectionFromAngle = function( angle )
    {
        var directions = {
            down: angle >= 45 && angle < 135, //90
            left: angle >= 135 || angle <= -135, //180
            up: angle < -45 && angle > -135, //270
            right: angle >= -45 && angle <= 45 //0
        };

        var direction, key;
        for(key in directions){
            if(directions[key]){
                direction = key;
                break;
            }
        }
        return direction;
    };


    /**
     * count the number of fingers in the event
     * when no fingers are detected, one finger is returned (mouse pointer)
     * @param  event
     * @return int  fingers
     */
    function countFingers( event )
    {
        // there is a bug on android (until v4?) that touches is always 1,
        // so no multitouch is supported, e.g. no, zoom and rotation...
        return event.touches ? event.touches.length : 1;
    }


    /**
     * get the x and y positions from the event object
     * @param  event
     * @return array  [{ x: int, y: int }]
     */
    function getXYfromEvent( event )
    {
        event = event || window.event;

        // no touches, use the event pageX and pageY
        if(!event.touches) {
            var doc = document,
                body = doc.body;

            return [{
                x: event.pageX || event.clientX + ( doc && doc.scrollLeft || body && body.scrollLeft || 0 ) - ( doc && doc.clientLeft || body && doc.clientLeft || 0 ),
                y: event.pageY || event.clientY + ( doc && doc.scrollTop || body && body.scrollTop || 0 ) - ( doc && doc.clientTop || body && doc.clientTop || 0 )
            }];
        }
        // multitouch, return array with positions
        else {
            var pos = [], src;
            for(var t=0, len=event.touches.length; t<len; t++) {
                src = event.touches[t];
                pos.push({ x: src.pageX, y: src.pageY });
            }
            return pos;
        }
    }


    /**
     * calculate the angle between two points
     * @param object pos1 { x: int, y: int }
     * @param object pos2 { x: int, y: int }
     */
    function getAngle( pos1, pos2 )
    {
        return Math.atan2(pos2.y - pos1.y, pos2.x - pos1.x) * 180 / Math.PI;
    }

    /**
     * trigger an event/callback by name with params
     * @param string name
     * @param array  params
     */
    function triggerEvent( eventName, params )
    {
        // return touches object
        params.touches = getXYfromEvent(params.originalEvent);
        params.type = eventName;

        // trigger callback
        if(isFunction(self["on"+ eventName])) {
            self["on"+ eventName].call(self, params);
        }
    }


    /**
     * cancel event
     * @param   object  event
     * @return  void
     */

    function cancelEvent(event){
        event = event || window.event;
        if(event.preventDefault){
            event.preventDefault();
        }else{
            event.returnValue = false;
            event.cancelBubble = true;
        }
    }


    /**
     * reset the internal vars to the start values
     */
    function reset()
    {
        _pos = {};
        _first = false;
        _fingers = 0;
        _distance = 0;
        _angle = 0;
        _gesture = null;
    }


    var gestures = {
        // hold gesture
        // fired on touchstart
        hold : function(event)
        {
            // only when one finger is on the screen
            if(options.hold) {
                _gesture = 'hold';
                clearTimeout(_hold_timer);

                _hold_timer = setTimeout(function() {
                    if(_gesture == 'hold') {
                        triggerEvent("hold", {
                            originalEvent   : event,
                            position        : _pos.start
                        });
                    }
                }, options.hold_timeout);
            }
        },


        // drag gesture
        // fired on mousemove
        drag : function(event)
        {
            // get the distance we moved
            var _distance_x = _pos.move[0].x - _pos.start[0].x;
            var _distance_y = _pos.move[0].y - _pos.start[0].y;
            _distance = Math.sqrt(_distance_x * _distance_x + _distance_y * _distance_y);

            // drag
            // minimal movement required
            if(options.drag && (_distance > options.drag_min_distance) || _gesture == 'drag') {
                // calculate the angle
                _angle = getAngle(_pos.start[0], _pos.move[0]);
                _direction = self.getDirectionFromAngle(_angle);

                // check the movement and stop if we go in the wrong direction
                var is_vertical = (_direction == 'up' || _direction == 'down');
                if(((is_vertical && !options.drag_vertical) || (!is_vertical && !options.drag_horizontal))
                    && (_distance > options.drag_min_distance)) {
                    return;
                }

                _gesture = 'drag';

                var position = { x: _pos.move[0].x - _offset.left,
                    y: _pos.move[0].y - _offset.top };

                var event_obj = {
                    originalEvent   : event,
                    position        : position,
                    direction       : _direction,
                    distance        : _distance,
                    distanceX       : _distance_x,
                    distanceY       : _distance_y,
                    angle           : _angle
                };

                // on the first time trigger the start event
                if(_first) {
                    triggerEvent("dragstart", event_obj);

                    _first = false;
                }

                // normal slide event
                triggerEvent("drag", event_obj);

                cancelEvent(event);
            }
        },


        // transform gesture
        // fired on touchmove
        transform : function(event)
        {
            if(options.transform) {
                var scale = event.scale || 1;
                var rotation = event.rotation || 0;

                if(countFingers(event) != 2) {
                    return false;
                }

                if(_gesture != 'drag' &&
                    (_gesture == 'transform' || Math.abs(1-scale) > options.scale_treshold
                        || Math.abs(rotation) > options.rotation_treshold)) {
                    _gesture = 'transform';

                    _pos.center = {  x: ((_pos.move[0].x + _pos.move[1].x) / 2) - _offset.left,
                        y: ((_pos.move[0].y + _pos.move[1].y) / 2) - _offset.top };

                    var event_obj = {
                        originalEvent   : event,
                        position        : _pos.center,
                        scale           : scale,
                        rotation        : rotation
                    };

                    // on the first time trigger the start event
                    if(_first) {
                        triggerEvent("transformstart", event_obj);
                        _first = false;
                    }

                    triggerEvent("transform", event_obj);

                    cancelEvent(event);

                    return true;
                }
            }

            return false;
        },


        // tap and double tap gesture
        // fired on touchend
        tap : function(event)
        {
            // compare the kind of gesture by time
            var now = new Date().getTime();
            var touch_time = now - _touch_start_time;

            // dont fire when hold is fired
            if(options.hold && !(options.hold && options.hold_timeout > touch_time)) {
                return;
            }

            // when previous event was tap and the tap was max_interval ms ago
            var is_double_tap = (function(){
                if (_prev_tap_pos && options.tap_double && _prev_gesture == 'tap' && (_touch_start_time - _prev_tap_end_time) < options.tap_max_interval) {
                    var x_distance = Math.abs(_prev_tap_pos[0].x - _pos.start[0].x);
                    var y_distance = Math.abs(_prev_tap_pos[0].y - _pos.start[0].y);
                    return (_prev_tap_pos && _pos.start && Math.max(x_distance, y_distance) < options.tap_double_distance);

                }
                return false;
            })();

            if(is_double_tap) {
                _gesture = 'double_tap';
                _prev_tap_end_time = null;

                triggerEvent("doubletap", {
                    originalEvent   : event,
                    position        : _pos.start
                });
                cancelEvent(event);
            }

            // single tap is single touch
            else {
                _gesture = 'tap';
                _prev_tap_end_time = now;
                _prev_tap_pos = _pos.start;

                if(options.tap) {
                    triggerEvent("tap", {
                        originalEvent   : event,
                        position        : _pos.start
                    });
                    cancelEvent(event);
                }
            }

        }

    };


    function handleEvents(event)
    {
        switch(event.type)
        {
            case 'mousedown':
            case 'touchstart':
                _pos.start = getXYfromEvent(event);
                _touch_start_time = new Date().getTime();
                _fingers = countFingers(event);
                _first = true;
                _event_start = event;

                // borrowed from jquery offset https://github.com/jquery/jquery/blob/master/src/offset.js
                var box = element.getBoundingClientRect();
                var clientTop  = element.clientTop  || document.body.clientTop  || 0;
                var clientLeft = element.clientLeft || document.body.clientLeft || 0;
                var scrollTop  = window.pageYOffset || element.scrollTop  || document.body.scrollTop;
                var scrollLeft = window.pageXOffset || element.scrollLeft || document.body.scrollLeft;

                _offset = {
                    top: box.top + scrollTop - clientTop,
                    left: box.left + scrollLeft - clientLeft
                };

                _mousedown = true;

                // hold gesture
                gestures.hold(event);

                if(options.prevent_default) {
                    cancelEvent(event);
                }
                break;

            case 'mousemove':
            case 'touchmove':
                if(!_mousedown) {
                    return false;
                }
                _event_move = event;
                _pos.move = getXYfromEvent(event);

                if(!gestures.transform(event)) {
                    gestures.drag(event);
                }
                break;

            case 'mouseup':
            case 'mouseout':
            case 'touchcancel':
            case 'touchend':
                if(!_mousedown || (_gesture != 'transform' && event.touches && event.touches.length > 0)) {
                    return false;
                }

                _mousedown = false;
                _event_end = event;

                // drag gesture
                // dragstart is triggered, so dragend is possible
                if(_gesture == 'drag') {
                    triggerEvent("dragend", {
                        originalEvent   : event,
                        direction       : _direction,
                        distance        : _distance,
                        angle           : _angle
                    });
                }

                // transform
                // transformstart is triggered, so transformed is possible
                else if(_gesture == 'transform') {
                    triggerEvent("transformend", {
                        originalEvent   : event,
                        position        : _pos.center,
                        scale           : event.scale,
                        rotation        : event.rotation
                    });
                }
                else {
                    gestures.tap(_event_start);
                }

                _prev_gesture = _gesture;

                // reset vars
                reset();
                break;
        }
    }


    // bind events for touch devices
    // except for windows phone 7.5, it doesnt support touch events..!
    if('ontouchstart' in window) {
        element.addEventListener("touchstart", handleEvents, false);
        element.addEventListener("touchmove", handleEvents, false);
        element.addEventListener("touchend", handleEvents, false);
        element.addEventListener("touchcancel", handleEvents, false);
    }
    // for non-touch
    else {

        if(element.addEventListener){ // prevent old IE errors
            element.addEventListener("mouseout", function(event) {
                if(!isInsideHammer(element, event.relatedTarget)) {
                    handleEvents(event);
                }
            }, false);
            element.addEventListener("mouseup", handleEvents, false);
            element.addEventListener("mousedown", handleEvents, false);
            element.addEventListener("mousemove", handleEvents, false);

            // events for older IE
        }else if(document.attachEvent){
            element.attachEvent("onmouseout", function(event) {
                if(!isInsideHammer(element, event.relatedTarget)) {
                    handleEvents(event);
                }
            }, false);
            element.attachEvent("onmouseup", handleEvents);
            element.attachEvent("onmousedown", handleEvents);
            element.attachEvent("onmousemove", handleEvents);
        }
    }


    /**
     * find if element is (inside) given parent element
     * @param   object  element
     * @param   object  parent
     * @return  bool    inside
     */
    function isInsideHammer(parent, child) {
        // get related target for IE
        if(!child && window.event && window.event.toElement){
            child = window.event.toElement;
        }

        if(parent === child){
            return true;
        }

        // loop over parentNodes of child until we find hammer element
        if(child){
            var node = child.parentNode;
            while(node !== null){
                if(node === parent){
                    return true;
                };
                node = node.parentNode;
            }
        }
        return false;
    }


    /**
     * merge 2 objects into a new object
     * @param   object  obj1
     * @param   object  obj2
     * @return  object  merged object
     */
    function mergeObject(obj1, obj2) {
        var output = {};

        if(!obj2) {
            return obj1;
        }

        for (var prop in obj1) {
            if (prop in obj2) {
                output[prop] = obj2[prop];
            } else {
                output[prop] = obj1[prop];
            }
        }
        return output;
    }

    function isFunction( obj ){
        return Object.prototype.toString.call( obj ) == "[object Function]";
    }
}"></script> <script src="data:application/x-javascript;base64,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"></script> <script src="data:application/x-javascript;base64,/**
 * @authors Luke Mahe
 * @authors Eric Bidelman
 * @fileoverview TODO
 */
document.cancelFullScreen = document.webkitCancelFullScreen ||
                            document.mozCancelFullScreen;

/**
 * @constructor
 */
function SlideDeck(el) {
  this.curSlide_ = 0;
  this.prevSlide_ = 0;
  this.config_ = null;
  this.container = el || document.querySelector('slides');
  this.slides = [];
  this.controller = null;

  this.getCurrentSlideFromHash_();

  // Call this explicitly. Modernizr.load won't be done until after DOM load.
  this.onDomLoaded_.bind(this)();
}

/**
 * @const
 * @private
 */
SlideDeck.prototype.SLIDE_CLASSES_ = [
  'far-past', 'past', 'current', 'next', 'far-next'];

/**
 * @const
 * @private
 */
SlideDeck.prototype.CSS_DIR_ = 'theme/css/';

/**
 * @private
 */
SlideDeck.prototype.getCurrentSlideFromHash_ = function() {
  var slideNo = parseInt(document.location.hash.substr(1));

  if (slideNo) {
    this.curSlide_ = slideNo - 1;
  } else {
    this.curSlide_ = 0;
  }
};

/**
 * @param {number} slideNo
 */
SlideDeck.prototype.loadSlide = function(slideNo) {
  if (slideNo) {
    this.curSlide_ = slideNo - 1;
    this.updateSlides_();
  }
};

/**
 * @private
 */
SlideDeck.prototype.onDomLoaded_ = function(e) {
  document.body.classList.add('loaded'); // Add loaded class for templates to use.

  this.slides = this.container.querySelectorAll('slide:not([hidden]):not(.hidden):not(.backdrop)');

  // If we're on a smartphone, apply special sauce.
  if (Modernizr.mq('only screen and (max-device-width: 480px)')) {
    // var style = document.createElement('link');
    // style.rel = 'stylesheet';
    // style.type = 'text/css';
    // style.href = this.CSS_DIR_ + 'phone.css';
    // document.querySelector('head').appendChild(style);

    // No need for widescreen layout on a phone.
    this.container.classList.remove('layout-widescreen');
  }

  this.loadConfig_(SLIDE_CONFIG);
  this.addEventListeners_();
  this.updateSlides_();

  // Add slide numbers and total slide count metadata to each slide.
  var that = this;
  for (var i = 0, slide; slide = this.slides[i]; ++i) {
    slide.dataset.slideNum = i + 1;
    slide.dataset.totalSlides = this.slides.length;

    slide.addEventListener('click', function(e) {
      if (document.body.classList.contains('overview')) {
        that.loadSlide(this.dataset.slideNum);
        e.preventDefault();
        window.setTimeout(function() {
          that.toggleOverview();
        }, 500);
      }
    }, false);
  }

  // Note: this needs to come after addEventListeners_(), which adds a
  // 'keydown' listener that this controller relies on.

  // Modernizr.touch isn't a sufficient check for devices that support both
  // touch and mouse. Create the controller in all cases.
  // // Also, no need to set this up if we're on mobile.
  // if (!Modernizr.touch) {
    this.controller = new SlideController(this);
    if (this.controller.isPopup) {
      document.body.classList.add('popup');
    }
  //}
};

/**
 * @private
 */
SlideDeck.prototype.addEventListeners_ = function() {
  document.addEventListener('keydown', this.onBodyKeyDown_.bind(this), true);
  window.addEventListener('popstate', this.onPopState_.bind(this), false);

  // var transEndEventNames = {
  //   'WebkitTransition': 'webkitTransitionEnd',
  //   'MozTransition': 'transitionend',
  //   'OTransition': 'oTransitionEnd',
  //   'msTransition': 'MSTransitionEnd',
  //   'transition': 'transitionend'
  // };
  //
  // // Find the correct transitionEnd vendor prefix.
  // window.transEndEventName = transEndEventNames[
  //     Modernizr.prefixed('transition')];
  //
  // // When slides are done transitioning, kickoff loading iframes.
  // // Note: we're only looking at a single transition (on the slide). This
  // // doesn't include autobuilds the slides may have. Also, if the slide
  // // transitions on multiple properties (e.g. not just 'all'), this doesn't
  // // handle that case.
  // this.container.addEventListener(transEndEventName, function(e) {
  //     this.enableSlideFrames_(this.curSlide_);
  // }.bind(this), false);

  // document.addEventListener('slideenter', function(e) {
  //   var slide = e.target;
  //   window.setTimeout(function() {
  //     this.enableSlideFrames_(e.slideNumber);
  //     this.enableSlideFrames_(e.slideNumber + 1);
  //   }.bind(this), 300);
  // }.bind(this), false);
};

/**
 * @private
 * @param {Event} e The pop event.
 */
SlideDeck.prototype.onPopState_ = function(e) {
  if (e.state != null) {
    this.curSlide_ = e.state;
    this.updateSlides_(true);
  }
};

/**
 * @param {Event} e
 */
SlideDeck.prototype.onBodyKeyDown_ = function(e) {

  // Don't handle keys if an input or text area is active. Do special handling
  // for selectize because it keeps focus within an offscreen textbox even
  // when just the select control is showing -- for selectize we refrain from
  // handling keys only when the text input is active or when the up or down
  // arrow key is pressed (which is used to open the list from the keyboard)
  var parentNode = e.target.parentNode || e.target; // handle no parent
  if (parentNode.classList && parentNode.classList.contains('selectize-input')) {
    if (parentNode.classList.contains('input-active') ||  // text input is active
       (e.keyCode == 38) || (e.keyCode == 40))            // up or down arrow
      return;
  } else if (/^(input|textarea)$/i.test(e.target.nodeName) ||
      e.target.isContentEditable) {
    return;
  }

  // Forward keydowns to the main slides if we're the popup.
  if (this.controller && this.controller.isPopup) {
    this.controller.sendMsg({keyCode: e.keyCode});
  }

  switch (e.keyCode) {
    case 13: // Enter
      if (document.body.classList.contains('overview')) {
        this.toggleOverview();
      }
      break;

    case 39: // right arrow
    case 32: // space
    case 34: // PgDn
      this.nextSlide();
      e.preventDefault();
      break;

    case 37: // left arrow
    case 8: // Backspace
    case 33: // PgUp
      this.prevSlide();
      e.preventDefault();
      break;

    case 40: // down arrow
      this.nextSlide();
      e.preventDefault();
      break;

    case 38: // up arrow
      this.prevSlide();
      e.preventDefault();
      break;

    case 72: // H: Toggle code highlighting
      document.body.classList.toggle('highlight-code');
      break;

    case 79: // O: Toggle overview
      this.toggleOverview();
      break;

    case 80: // P
      if (this.controller && this.controller.isPopup) {
        document.body.classList.toggle('with-notes');
      } else if (this.controller && !this.controller.popup) {
        document.body.classList.toggle('with-notes');
      }
      break;

    case 82: // R
      // TODO: implement refresh on main slides when popup is refreshed.
      break;

    case 27: // ESC: Hide notes and highlighting
      document.body.classList.remove('with-notes');
      document.body.classList.remove('highlight-code');

      if (document.body.classList.contains('overview')) {
        this.toggleOverview();
      }
      break;

    case 70: // F: Toggle fullscreen
       // Only respect 'f' on body. Don't want to capture keys from an <input>.
       // Also, ignore browser's fullscreen shortcut (cmd+shift+f) so we don't
       // get trapped in fullscreen!
      if (document.cancelFullScreen !== undefined && e.target == document.body && !(e.shiftKey && e.metaKey)) {
        if (document.mozFullScreen !== undefined && !document.mozFullScreen) {
          document.body.mozRequestFullScreen(Element.ALLOW_KEYBOARD_INPUT);
        } else if (document.webkitIsFullScreen !== undefined && !document.webkitIsFullScreen) {
          document.body.webkitRequestFullScreen(Element.ALLOW_KEYBOARD_INPUT);
        } else {
          document.cancelFullScreen();
        }
      }
      break;

    case 87: // W: Toggle widescreen
      // Only respect 'w' on body. Don't want to capture keys from an <input>.
      if (e.target == document.body && !(e.shiftKey && e.metaKey)) {
        this.container.classList.toggle('layout-widescreen');
      }
      break;
  }
};

/**
 *
 */
SlideDeck.prototype.focusOverview_ = function() {
  var overview = document.body.classList.contains('overview');

  for (var i = 0, slide; slide = this.slides[i]; i++) {
    slide.style[Modernizr.prefixed('transform')] = overview ?
        'translateZ(-2500px) translate(' + (( i - this.curSlide_ ) * 105) +
                                       '%, 0%)' : '';
  }
};

/**
 */
SlideDeck.prototype.toggleOverview = function() {
  document.body.classList.toggle('overview');

  this.focusOverview_();
};

/**
 * @private
 */
SlideDeck.prototype.loadConfig_ = function(config) {
  if (!config) {
    return;
  }

  this.config_ = config;

  var settings = this.config_.settings;

  this.loadTheme_(settings.theme || []);

  if (settings.favIcon) {
    this.addFavIcon_(settings.favIcon);
  }

  // Prettyprint. Default to on.
  if (!!!('usePrettify' in settings) || settings.usePrettify) {
    prettyPrint();
  }

  if (settings.analytics) {
    this.loadAnalytics_();
  }

  if (settings.fonts) {
    this.addFonts_(settings.fonts);
  }

  // Builds. Default to on.
  if (!!!('useBuilds' in settings) || settings.useBuilds) {
    this.makeBuildLists_();
  }

  if (settings.title) {
    document.title = settings.title.replace(/<br\/?>/, ' ');
    if (settings.eventInfo && settings.eventInfo.title) {
      document.title +=  ' - ' + settings.eventInfo.title;
    }
    document.querySelector('[data-config-title]').innerHTML = settings.title;
  }

  if (settings.subtitle) {
    document.querySelector('[data-config-subtitle]').innerHTML = settings.subtitle;
  }

  if (this.config_.presenters) {
    var presenters = this.config_.presenters;
    var dataConfigContact = document.querySelector('[data-config-contact]');

    var html = [];
    if (presenters.length == 1) {
      var p = presenters[0];

      var presenterTitle = [p.name];
      if (p.company) {
        presenterTitle.push(p.company);
      }
      html = presenterTitle.join(' - ') + '<br>';

      var gplus = p.gplus ? '<span>g+</span><a href="' + p.gplus +
          '">' + p.gplus.replace(/https?:\/\//, '') + '</a>' : '';

      var twitter = p.twitter ? '<span>twitter</span>' +
          '<a href="http://twitter.com/' + p.twitter + '">' +
          p.twitter + '</a>' : '';

      var www = p.www ? '<span>www</span><a href="' + p.www +
                        '">' + p.www.replace(/https?:\/\//, '') + '</a>' : '';

      var github = p.github ? '<span>github</span><a href="' + p.github +
          '">' + p.github.replace(/https?:\/\//, '') + '</a>' : '';

      var html2 = [gplus, twitter, www, github].join('<br>');

      if (dataConfigContact) {
        dataConfigContact.innerHTML = html2;
      }
    } else {
      for (var i = 0, p; p = presenters[i]; ++i) {
        html.push(p.name + ' - ' + p.company);
      }
      html = html.join('<br>');
      if (dataConfigContact) {
        dataConfigContact.innerHTML = html;
      }
    }

    var dataConfigPresenter = document.querySelector('[data-config-presenter]');
    if (dataConfigPresenter) {
      dataConfigPresenter.innerHTML = html;
      if (settings.eventInfo) {
        var date = settings.eventInfo.date;
        var dateInfo = date ? ' - <time>' + date + '</time>' : '';
        dataConfigPresenter.innerHTML += settings.eventInfo.title + dateInfo;
      }
    }
  }

  /* Left/Right tap areas. Default to including. */
  if (!!!('enableSlideAreas' in settings) || settings.enableSlideAreas) {
    var el = document.createElement('div');
    el.classList.add('slide-area');
    el.id = 'prev-slide-area';
    el.addEventListener('click', this.prevSlide.bind(this), false);
    this.container.appendChild(el);

    var el = document.createElement('div');
    el.classList.add('slide-area');
    el.id = 'next-slide-area';
    el.addEventListener('click', this.nextSlide.bind(this), false);
    this.container.appendChild(el);
  }

  if (Modernizr.touch && (!!!('enableTouch' in settings) ||
      settings.enableTouch)) {
    var self = this;

    // Note: this prevents mobile zoom in/out but prevents iOS from doing
    // it's crazy scroll over effect and disaligning the slides.
    window.addEventListener('touchstart', function(e) {
      e.preventDefault();
    }, false);

    var hammer = new Hammer(this.container);
    hammer.ondragend = function(e) {
      if (e.direction == 'right' || e.direction == 'down') {
        self.prevSlide();
      } else if (e.direction == 'left' || e.direction == 'up') {
        self.nextSlide();
      }
    };
  }
};

/**
 * @private
 * @param {Array.<string>} fonts
 */
SlideDeck.prototype.addFonts_ = function(fonts) {
  var el = document.createElement('link');
  el.rel = 'stylesheet';
  el.href = ('https:' == document.location.protocol ? 'https' : 'http') +
      '://fonts.googleapis.com/css?family=' + fonts.join('|') + '&v2';
  document.querySelector('head').appendChild(el);
};

/**
 * @private
 */
SlideDeck.prototype.buildNextItem_ = function() {
  var slide = this.slides[this.curSlide_];
  var toBuild = slide.querySelector('.to-build');
  var built = slide.querySelector('.build-current');

  if (built) {
    built.classList.remove('build-current');
    if (built.classList.contains('fade')) {
      built.classList.add('build-fade');
    }
  }

  if (!toBuild) {
    var items = slide.querySelectorAll('.build-fade');
    for (var j = 0, item; item = items[j]; j++) {
      item.classList.remove('build-fade');
    }
    return false;
  }

  toBuild.classList.remove('to-build');
  toBuild.classList.add('build-current');

  return true;
};

/**
 * @param {boolean=} opt_dontPush
 */
SlideDeck.prototype.prevSlide = function(opt_dontPush) {
  if (this.curSlide_ > 0) {
    var bodyClassList = document.body.classList;
    bodyClassList.remove('highlight-code');

    // Toggle off speaker notes if they're showing when we move backwards on the
    // main slides. If we're the speaker notes popup, leave them up.
    if (this.controller && !this.controller.isPopup) {
      bodyClassList.remove('with-notes');
    } else if (!this.controller) {
      bodyClassList.remove('with-notes');
    }

    this.prevSlide_ = this.curSlide_--;

    this.updateSlides_(opt_dontPush);
  }
};

/**
 * @param {boolean=} opt_dontPush
 */
SlideDeck.prototype.nextSlide = function(opt_dontPush) {
  if (!document.body.classList.contains('overview') && this.buildNextItem_()) {
    return;
  }

  if (this.curSlide_ < this.slides.length - 1) {
    var bodyClassList = document.body.classList;
    bodyClassList.remove('highlight-code');

    // Toggle off speaker notes if they're showing when we advanced on the main
    // slides. If we're the speaker notes popup, leave them up.
    if (this.controller && !this.controller.isPopup) {
      bodyClassList.remove('with-notes');
    } else if (!this.controller) {
      bodyClassList.remove('with-notes');
    }

    this.prevSlide_ = this.curSlide_++;

    this.updateSlides_(opt_dontPush);
  }
};

/* Slide events */

/**
 * Triggered when a slide enter/leave event should be dispatched.
 *
 * @param {string} type The type of event to trigger
 *     (e.g. 'slideenter', 'slideleave').
 * @param {number} slideNo The index of the slide that is being left.
 */
SlideDeck.prototype.triggerSlideEvent = function(type, slideNo) {
  var el = this.getSlideEl_(slideNo);
  if (!el) {
    return;
  }

  // Call onslideenter/onslideleave if the attribute is defined on this slide.
  var func = el.getAttribute(type);
  if (func) {
    new Function(func).call(el); // TODO: Don't use new Function() :(
  }

  // Dispatch event to listeners setup using addEventListener.
  var evt = document.createEvent('Event');
  evt.initEvent(type, true, true);
  evt.slideNumber = slideNo + 1; // Make it readable
  evt.slide = el;

  el.dispatchEvent(evt);
};

/**
 * @private
 */
SlideDeck.prototype.updateSlides_ = function(opt_dontPush) {
  var dontPush = opt_dontPush || false;

  var curSlide = this.curSlide_;
  for (var i = 0; i < this.slides.length; ++i) {
    switch (i) {
      case curSlide - 2:
        this.updateSlideClass_(i, 'far-past');
        break;
      case curSlide - 1:
        this.updateSlideClass_(i, 'past');
        break;
      case curSlide:
        this.updateSlideClass_(i, 'current');
        break;
      case curSlide + 1:
        this.updateSlideClass_(i, 'next');
        break;
      case curSlide + 2:
        this.updateSlideClass_(i, 'far-next');
        break;
      default:
        this.updateSlideClass_(i);
        break;
    }
  };

  this.triggerSlideEvent('slideleave', this.prevSlide_);
  this.triggerSlideEvent('slideenter', curSlide);

// window.setTimeout(this.disableSlideFrames_.bind(this, curSlide - 2), 301);
//
// this.enableSlideFrames_(curSlide - 1); // Previous slide.
// this.enableSlideFrames_(curSlide + 1); // Current slide.
// this.enableSlideFrames_(curSlide + 2); // Next slide.

   // Enable current slide's iframes (needed for page loat at current slide).
   this.enableSlideFrames_(curSlide + 1);

   // No way to tell when all slide transitions + auto builds are done.
   // Give ourselves a good buffer to preload the next slide's iframes.
   window.setTimeout(this.enableSlideFrames_.bind(this, curSlide + 2), 1000);

  this.updateHash_(dontPush);

  if (document.body.classList.contains('overview')) {
    this.focusOverview_();
    return;
  }

};

/**
 * @private
 * @param {number} slideNo
 */
SlideDeck.prototype.enableSlideFrames_ = function(slideNo) {
  var el = this.slides[slideNo - 1];
  if (!el) {
    return;
  }

  var frames = el.querySelectorAll('iframe');
  for (var i = 0, frame; frame = frames[i]; i++) {
    this.enableFrame_(frame);
  }
};

/**
 * @private
 * @param {number} slideNo
 */
SlideDeck.prototype.enableFrame_ = function(frame) {
  var src = frame.dataset.src;
  if (src && frame.src != src) {
    frame.src = src;
  }
};

/**
 * @private
 * @param {number} slideNo
 */
SlideDeck.prototype.disableSlideFrames_ = function(slideNo) {
  var el = this.slides[slideNo - 1];
  if (!el) {
    return;
  }

  var frames = el.querySelectorAll('iframe');
  for (var i = 0, frame; frame = frames[i]; i++) {
    this.disableFrame_(frame);
  }
};

/**
 * @private
 * @param {Node} frame
 */
SlideDeck.prototype.disableFrame_ = function(frame) {
  frame.src = 'about:blank';
};

/**
 * @private
 * @param {number} slideNo
 */
SlideDeck.prototype.getSlideEl_ = function(no) {
  if ((no < 0) || (no >= this.slides.length)) {
    return null;
  } else {
    return this.slides[no];
  }
};

/**
 * @private
 * @param {number} slideNo
 * @param {string} className
 */
SlideDeck.prototype.updateSlideClass_ = function(slideNo, className) {
  var el = this.getSlideEl_(slideNo);

  if (!el) {
    return;
  }

  if (className) {
    el.classList.add(className);
  }

  for (var i = 0, slideClass; slideClass = this.SLIDE_CLASSES_[i]; ++i) {
    if (className != slideClass) {
      el.classList.remove(slideClass);
    }
  }
};

/**
 * @private
 */
SlideDeck.prototype.makeBuildLists_ = function () {
  for (var i = this.curSlide_, slide; slide = this.slides[i]; ++i) {
    var items = slide.querySelectorAll('.build > *');
    for (var j = 0, item; item = items[j]; ++j) {
      if (item.classList) {
        item.classList.add('to-build');
        if (item.parentNode.classList.contains('fade')) {
          item.classList.add('fade');
        }
      }
    }
  }
};

/**
 * @private
 * @param {boolean} dontPush
 */
SlideDeck.prototype.updateHash_ = function(dontPush) {
  if (!dontPush) {
    var slideNo = this.curSlide_ + 1;
    // Add everything except the hash.
    var loc = location.protocol+'//'+location.host+location.pathname+(location.search?location.search:"");
    var hash = '#' + slideNo;
    if (window.history.pushState && (location.protocol !== "file:")) {
      window.history.pushState(this.curSlide_, 'Slide ' + slideNo, loc + hash);
    } else {
      window.location.replace(loc + hash);
    }

    // Record GA hit on this slide.
    if(typeof window.ga === 'function') {
      ga('set', 'page', hash)
      ga('send', 'pageview');
    }
  }
};


/**
 * @private
 * @param {string} favIcon
 */
SlideDeck.prototype.addFavIcon_ = function(favIcon) {
  var el = document.createElement('link');
  el.rel = 'icon';
  el.type = 'image/png';
  el.href = favIcon;
  document.querySelector('head').appendChild(el);
};

/**
 * @private
 * @param {string} theme
 */
SlideDeck.prototype.loadTheme_ = function(theme) {
  var styles = [];
  if (theme.constructor.name === 'String') {
    styles.push(theme);
  } else {
    styles = theme;
  }

  for (var i = 0, style; themeUrl = styles[i]; i++) {
    var style = document.createElement('link');
    style.rel = 'stylesheet';
    style.type = 'text/css';
    if (themeUrl.indexOf('http') == -1) {
      style.href = this.CSS_DIR_ + themeUrl + '.css';
    } else {
      style.href = themeUrl;
    }
    document.querySelector('head').appendChild(style);
  }
};

/**
 * @private
 */
SlideDeck.prototype.loadAnalytics_ = function() {
  (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
    (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
    m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
  })(window,document,'script','//www.google-analytics.com/analytics.js','ga');

  ga('create', this.config_.settings.analytics, 'auto');
  ga('send', 'pageview');
};


var loadDeck = function(event) {
  // Polyfill missing APIs (if we need to), then create the slide deck.
  // iOS < 5 needs classList, dataset, and window.matchMedia. Modernizr contains
  // the last one.
  Modernizr.load({
    complete: function() {
      window.slidedeck = new SlideDeck();
    }
  });
};

if (document.readyState !== "loading" &&
    document.querySelector('slides') === null) { 
  // if the document is done loading but our element hasn't yet appeared, defer
  // loading of the deck
  window.setTimeout(function() {
    loadDeck(null);
  }, 0);
} else {
  // still loading the DOM, so wait until it's finished
  document.addEventListener("DOMContentLoaded", loadDeck);
}



"></script> <style type="text/css"> b, strong { font-weight: bold; } em { font-style: italic; } slides > slide { -webkit-transition: all 0.4s ease-in-out; -moz-transition: all 0.4s ease-in-out; -o-transition: all 0.4s ease-in-out; transition: all 0.4s ease-in-out; } .auto-fadein { -webkit-transition: opacity 0.6s ease-in; -webkit-transition-delay: 0.4s; -moz-transition: opacity 0.6s ease-in 0.4s; -o-transition: opacity 0.6s ease-in 0.4s; transition: opacity 0.6s ease-in 0.4s; opacity: 0; } </style>3/31/2018
- This is the tenth course of the Coursera Data Science Specialization, Data Science Capstone. This course focuses on analyzing a large corpus of text documents to discover the structure in the data and how words are put together to build a predictive text model.
- Contents
- Text data analysis: analysis of the corpus to understand the relationship of words and word pairs
- Predictive modeling: build basice n-gram models and develop algorithms to facilitate text prediction
- Shiny app development: produce a web-based Shiny app interphase to predict next words
- Getting and cleaning the data: profanity was first removed and words tokenized
- Exploratory data analysis: the frequencies of words and word paris were calculated
- Modeling: 2-7 gram models were built to facilitate word prediction
- Prediciton model:
- Katz's back-off model was used to predict the next word
- The model iterates from 7-gram to 2-gram to find matches in the last n-1 words
- In the case of unseen n-gram, the most frequent word, 'the', is returned
- To improve efficiency, word pairs that appear less than 5 times in the corpus were removed
- The data analysis and model building writeups can be found on GitHub
- The Shiny app for prediction can be found here
- The app takes in the following inputs:
- query word/phrase that the user inputs
- number of predicted next word
- The predicted next word(s) will show up in the order of most frequently used to less frequently used
- This course is part of the Coursera Data Science Specialization
- The Quanteda package was used for data analysis and n-gram generation
- Read more about Katz's back-off model