NLP ML (Built-In)

5 Stemming.ipynb

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   "source": [
    "## Stemming"
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       "  <thead>\n",
       "    <tr style=\"text-align: right;\">\n",
       "      <th></th>\n",
       "      <th>label</th>\n",
       "      <th>body_text</th>\n",
       "      <th>body_text_clean</th>\n",
       "      <th>body_text_tokenized</th>\n",
       "      <th>body_text_nostop</th>\n",
       "      <th>body_text_stemmed</th>\n",
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       "  </thead>\n",
       "  <tbody>\n",
       "    <tr>\n",
       "      <th>0</th>\n",
       "      <td>ham</td>\n",
       "      <td>I've been searching for the right words to tha...</td>\n",
       "      <td>Ive been searching for the right words to than...</td>\n",
       "      <td>[ive, been, searching, for, the, right, words,...</td>\n",
       "      <td>[ive, searching, right, words, thank, breather...</td>\n",
       "      <td>[ive, search, right, word, thank, breather, pr...</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>1</th>\n",
       "      <td>spam</td>\n",
       "      <td>Free entry in 2 a wkly comp to win FA Cup fina...</td>\n",
       "      <td>Free entry in 2 a wkly comp to win FA Cup fina...</td>\n",
       "      <td>[free, entry, in, 2, a, wkly, comp, to, win, f...</td>\n",
       "      <td>[free, entry, 2, wkly, comp, win, fa, cup, fin...</td>\n",
       "      <td>[free, entri, 2, wkli, comp, win, fa, cup, fin...</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>2</th>\n",
       "      <td>ham</td>\n",
       "      <td>Nah I don't think he goes to usf, he lives aro...</td>\n",
       "      <td>Nah I dont think he goes to usf he lives aroun...</td>\n",
       "      <td>[nah, i, dont, think, he, goes, to, usf, he, l...</td>\n",
       "      <td>[nah, dont, think, goes, usf, lives, around, t...</td>\n",
       "      <td>[nah, dont, think, goe, usf, live, around, tho...</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>3</th>\n",
       "      <td>ham</td>\n",
       "      <td>Even my brother is not like to speak with me. ...</td>\n",
       "      <td>Even my brother is not like to speak with me T...</td>\n",
       "      <td>[even, my, brother, is, not, like, to, speak, ...</td>\n",
       "      <td>[even, brother, like, speak, treat, like, aids...</td>\n",
       "      <td>[even, brother, like, speak, treat, like, aid,...</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>4</th>\n",
       "      <td>ham</td>\n",
       "      <td>I HAVE A DATE ON SUNDAY WITH WILL!!</td>\n",
       "      <td>I HAVE A DATE ON SUNDAY WITH WILL</td>\n",
       "      <td>[i, have, a, date, on, sunday, with, will]</td>\n",
       "      <td>[date, sunday]</td>\n",
       "      <td>[date, sunday]</td>\n",
       "    </tr>\n",
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      "text/plain": [
       "  label                                          body_text  \\\n",
       "0   ham  I've been searching for the right words to tha...   \n",
       "1  spam  Free entry in 2 a wkly comp to win FA Cup fina...   \n",
       "2   ham  Nah I don't think he goes to usf, he lives aro...   \n",
       "3   ham  Even my brother is not like to speak with me. ...   \n",
       "4   ham                I HAVE A DATE ON SUNDAY WITH WILL!!   \n",
       "\n",
       "                                     body_text_clean  \\\n",
       "0  Ive been searching for the right words to than...   \n",
       "1  Free entry in 2 a wkly comp to win FA Cup fina...   \n",
       "2  Nah I dont think he goes to usf he lives aroun...   \n",
       "3  Even my brother is not like to speak with me T...   \n",
       "4                  I HAVE A DATE ON SUNDAY WITH WILL   \n",
       "\n",
       "                                 body_text_tokenized  \\\n",
       "0  [ive, been, searching, for, the, right, words,...   \n",
       "1  [free, entry, in, 2, a, wkly, comp, to, win, f...   \n",
       "2  [nah, i, dont, think, he, goes, to, usf, he, l...   \n",
       "3  [even, my, brother, is, not, like, to, speak, ...   \n",
       "4         [i, have, a, date, on, sunday, with, will]   \n",
       "\n",
       "                                    body_text_nostop  \\\n",
       "0  [ive, searching, right, words, thank, breather...   \n",
       "1  [free, entry, 2, wkly, comp, win, fa, cup, fin...   \n",
       "2  [nah, dont, think, goes, usf, lives, around, t...   \n",
       "3  [even, brother, like, speak, treat, like, aids...   \n",
       "4                                     [date, sunday]   \n",
       "\n",
       "                                   body_text_stemmed  \n",
       "0  [ive, search, right, word, thank, breather, pr...  \n",
       "1  [free, entri, 2, wkli, comp, win, fa, cup, fin...  \n",
       "2  [nah, dont, think, goe, usf, live, around, tho...  \n",
       "3  [even, brother, like, speak, treat, like, aid,...  \n",
       "4                                     [date, sunday]  "
      ]
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     "execution_count": 12,
     "metadata": {},
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   "source": [
    "ps = nltk.PorterStemmer()\n",
    "\n",
    "def stemming(tokenized_text):\n",
    "    text = [ps.stem(word) for word in tokenized_text]\n",
    "    return text\n",
    "\n",
    "data['body_text_stemmed'] = data['body_text_nostop'].apply(lambda x: stemming(x))\n",
    "\n",
    "data.head()"
   ]
  }
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