Made some changes to presentation

edX Lightning Talk.ipynb

@@ -296,8 +296,17 @@
    "source": [
     "How do we know which one to pick as the next word?\n",
     "\n",
-    "Why not the word that occurred the most often after the condition in the corpus?\n",
-    "\n",
+    "Why not the word that occurred the most often after the condition in the corpus?"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {
+    "slideshow": {
+     "slide_type": "fragment"
+    }
+   },
+   "source": [
     "We can use a **Conditional Frequency Distribution (CFD)** to figure that out!\n",
     "\n",
     "A **CFD** can tell us: given a **condition**, what is **likely** to follow?"
@@ -332,7 +341,8 @@
     }
    ],
    "source": [
-    "words = 'The quick brown fox jumped over the lazy dog and the quick cat'.split(' ')\n",
+    "words = ('The quick brown fox jumped over the '\n",
+    "        'lazy dog and the quick cat').split(' ')\n",
     "print words"
    ]
   },
@@ -349,8 +359,18 @@
    "source": [
     "from collections import defaultdict\n",
     "\n",
-    "cfd = defaultdict(lambda: defaultdict(lambda: 0))\n",
-    "condition = 'the'"
+    "cfd = defaultdict(lambda: defaultdict(lambda: 0))"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {
+    "slideshow": {
+     "slide_type": "slide"
+    }
+   },
+   "source": [
+    "## Conditional Frequency Distributions (CFDs) ##"
    ]
   },
   {
@@ -365,7 +385,15 @@
     {
      "data": {
       "text/plain": [
-       "{'the': {'lazy': 1, 'quick': 2}}"
+       "{'and': {'the': 1},\n",
+       " 'brown': {'fox': 1},\n",
+       " 'dog': {'and': 1},\n",
+       " 'fox': {'jumped': 1},\n",
+       " 'jumped': {'over': 1},\n",
+       " 'lazy': {'dog': 1},\n",
+       " 'over': {'the': 1},\n",
+       " 'quick': {'brown': 1},\n",
+       " 'the': {'lazy': 1, 'quick': 2}}"
       ]
      },
      "execution_count": 8,
@@ -374,9 +402,8 @@
     }
    ],
    "source": [
-    "for i in range(len(words) - 2):\n",
-    "    if words[i].lower() == condition:\n",
-    "        cfd[condition][words[i+1]] += 1\n",
+    "for i in range(len(words) - 2):  # loop to the next-to-last word\n",
+    "    cfd[words[i].lower()][words[i+1].lower()] += 1\n",
     "\n",
     "# pretty print the defaultdict\n",
     "{k: dict(v) for k, v in dict(cfd).items()}"
@@ -386,11 +413,11 @@
    "cell_type": "markdown",
    "metadata": {
     "slideshow": {
-     "slide_type": "slide"
+     "slide_type": "fragment"
     }
    },
    "source": [
-    "## What's the most likely? ##"
+    "So, what's the most likely word to follow `'the'`?"
    ]
   },
   {
@@ -414,7 +441,7 @@
     }
    ],
    "source": [
-    "max(cfd[condition])"
+    "max(cfd['the'])"
    ]
   },
   {
@@ -447,7 +474,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 10,
+   "execution_count": 31,
    "metadata": {
     "slideshow": {
      "slide_type": "fragment"
@@ -458,7 +485,7 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "must therefore that half ago for hope that occasion , Perry -- abundance about ten\n"
+      "her reserve and concealment towards some feelings in moving slowly together . You will shew\n"
      ]
     }
    ],
@@ -599,7 +626,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 15,
+   "execution_count": 30,
    "metadata": {
     "slideshow": {
      "slide_type": "fragment"
@@ -612,22 +639,16 @@
      "text": [
       "(SBARQ\n",
       "  (SQ\n",
-      "    (NP (PRP she))\n",
-      "    (VP\n",
-      "      (VBD was)\n",
-      "      (VBN obliged)\n",
-      "      (S+VP (TO to) (VP (VB stop) (CC and) (VB think)))))\n",
+      "    (NP (PRP I))\n",
+      "    (VP (VBP do) (RB not) (VB advise) (NP (DT the) (NN custard))))\n",
       "  (. .))\n",
-      "she was obliged to stop and think .\n",
+      "I do not advise the custard .\n",
       "==============================\n",
-      "They was hacked to amp ; support !\n",
+      "I do n't want the drone !\n",
       "(SBARQ\n",
       "  (SQ\n",
-      "    (NP (PRP They))\n",
-      "    (VP\n",
-      "      (VBD was)\n",
-      "      (VBN hacked)\n",
-      "      (S+VP (TO to) (VP (VB amp) (CC ;) (VB support)))))\n",
+      "    (NP (PRP I))\n",
+      "    (VP (VBP do) (RB n't) (VB want) (NP (DT the) (NN drone))))\n",
       "  (. !))\n"
      ]
     }
@@ -637,7 +658,7 @@
     "\n",
     "# inserts matching syntax subtrees from trump.txt into\n",
     "# trees from austen-emma.txt\n",
-    "generate('trump.txt', word_limit=15)"
+    "generate('trump.txt', word_limit=10)"
    ]
   },
   {