470 lines
14 KiB
Plaintext
470 lines
14 KiB
Plaintext
{
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"cells": [
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"# NLP-LAB Exercise 01 by jonas weinz\n",
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"----"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 1,
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"metadata": {},
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"outputs": [],
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"source": [
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"%matplotlib ipympl\n",
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"import nltk\n",
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"import pprint\n",
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"from sklearn.tree import DecisionTreeClassifier\n",
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"from sklearn.feature_extraction import DictVectorizer\n",
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"from sklearn.pipeline import Pipeline"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## implementing own classifiers"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"* writing an own feature funtion"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 2,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"'\\n return {\\n \\'word\\': word,\\n \\'is_capitalized\\': word[0].upper() == word[0],\\n \\'prefix-1\\': word[0],\\n \\'suffix-1\\': word[-1],\\n \\'prev_word\\': \\'\\' if index == 0 else sentence[index - 1],\\n \\'next_word\\': \\'\\' if index == len(sentence) - 1 else sentence[index + 1],\\n \\'length\\': len(word),\\n \\'index\\' : index,\\n \\'rev_index\\': len(sentence) - index,\\n \\'sentence_length\\': len(sentence)#,\\n \\'relative_third\\': relative_third,\\n \\'is_punctuation_mark\\': is_punctuation_mark,\\n \\',\\': word == \",\",\\n \\'.\\': word == \".\",\\n \\'!\\': word == \"!\",\\n \\'?\\': word == \"?\"\\n }\\n'"
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]
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},
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"execution_count": 2,
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"metadata": {},
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"output_type": "execute_result"
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}
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],
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"source": [
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"def features(sentence, index):\n",
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" word = sentence[index]\n",
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" is_punctuation_mark = word == \"!\" or word == \".\" or word == \",\" or word == \"?\"\n",
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" sentence_length = len(sentence)\n",
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" relative_third = (index * 3) // sentence_length \n",
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" vowels = word.count('a') + word.count('e') + word.count('i') + word.count('o') + word.count('u')\n",
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" return {\n",
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" 'word': word,\n",
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" 'is_capitalized': sentence[index][0].upper() == sentence[index][0],\n",
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" 'prefix-1': sentence[index][0],\n",
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" 'suffix-1': sentence[index][-1],\n",
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" 'prefix-2': sentence[index][1] if len(word) > 1 else '',\n",
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" 'suffix-2': sentence[index][-2] if len(word) > 1 else '',\n",
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" 'prev_word': '' if index == 0 else sentence[index - 1],\n",
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" 'next_word': '' if index == len(sentence) - 1 else sentence[index + 1],\n",
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" 'length': len(word),\n",
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" 'index' : index,\n",
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" 'rev_index': len(sentence) - index,\n",
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" 'sentence_length_': len(sentence),\n",
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" 'relative_third': relative_third,\n",
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" 'numerical': word.isnumeric(),\n",
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" 'is_punctuation_mark': is_punctuation_mark,\n",
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" ',': word == \",\",\n",
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" '.': word == \".\",\n",
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" '!': word == \"!\",\n",
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" '?': word == \"?\",\n",
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" 'vowels' : vowels\n",
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" }\n",
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"'''\n",
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" return {\n",
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" 'word': word,\n",
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" 'is_capitalized': word[0].upper() == word[0],\n",
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" 'prefix-1': word[0],\n",
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" 'suffix-1': word[-1],\n",
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" 'prev_word': '' if index == 0 else sentence[index - 1],\n",
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" 'next_word': '' if index == len(sentence) - 1 else sentence[index + 1],\n",
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" 'length': len(word),\n",
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" 'index' : index,\n",
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" 'rev_index': len(sentence) - index,\n",
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" 'sentence_length': len(sentence)#,\n",
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" 'relative_third': relative_third,\n",
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" 'is_punctuation_mark': is_punctuation_mark,\n",
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" ',': word == \",\",\n",
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" '.': word == \".\",\n",
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" '!': word == \"!\",\n",
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" '?': word == \"?\"\n",
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" }\n",
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"'''"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 3,
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"metadata": {},
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"outputs": [],
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"source": [
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"test_sentence = ['The','cake','is','a','lie','!']\n",
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"#for i in range(len(test_sentence)):\n",
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"# pprint.pprint(features(test_sentence, i))"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"* function for creating training sets"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 4,
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"metadata": {},
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"outputs": [],
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"source": [
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"def untag(tagged_sentence):\n",
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" return [w for w,t in tagged_sentence]\n",
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"\n",
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"def transform_to_dataset(tagged_sentences):\n",
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" X,y = [], []\n",
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" \n",
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" for s in tagged_sentences:\n",
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" for i in range(len(s)):\n",
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" X.append(features(untag(s),i))\n",
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" y.append(s[i][1])\n",
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" return X,y\n",
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"\n",
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"def create_training_and_test_set(annotated_sentences, relative_cutoff):\n",
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" cutoff = int(relative_cutoff * len(annotated_sentences))\n",
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" training_sentences = annotated_sentences[:cutoff]\n",
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" test_sentences = annotated_sentences[cutoff:]\n",
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" \n",
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" X,y = transform_to_dataset(training_sentences)\n",
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" tX, ty = transform_to_dataset(test_sentences)\n",
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" \n",
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" return X,y,tX,ty"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"* Decision Tree classifier"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 5,
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"metadata": {},
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"outputs": [],
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"source": [
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"def train_classifier(X,y,classifier,max_size=10000):\n",
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" clf = Pipeline([\n",
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" ('vectorizer', DictVectorizer(sparse=False)),\n",
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" ('classifier', classifier)\n",
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" ])\n",
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" \n",
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" print(\"start training…\")\n",
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" \n",
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" clf.fit(\n",
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" X if len(X) < max_size else X[:max_size],\n",
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" y if len(y) < max_size else y[:max_size]\n",
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" )\n",
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" \n",
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" print(\"training done\")\n",
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" \n",
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" return clf"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"* classifier evaluater"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 6,
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"metadata": {},
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"outputs": [],
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"source": [
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"def test_classifier(clf, tX, ty):\n",
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" accuracy = clf.score(tX, ty)\n",
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" print(\"Accuracy: \", accuracy)\n",
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" # TODO: more analytics\n",
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" return accuracy"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Exercise 01:"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"### Performance 1\n"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"#### Model 01\n",
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"* train and testing english custom POS tagger model:"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 7,
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"metadata": {},
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"outputs": [],
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"source": [
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"def model_01(X,y,tX,ty, max_size=1000):\n",
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" #classifier = DecisionTreeClassifier(criterion='entropy')\n",
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" from sklearn.neural_network import MLPClassifier\n",
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" model01_clf = train_classifier(X,y,MLPClassifier(),max_size=1000)\n",
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" return test_classifier(clf=model01_clf, tX=tX, ty=ty)"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"#### Model 02"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 8,
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"metadata": {},
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"outputs": [],
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"source": [
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"def model_02(tX,ty):\n",
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" m2_y = nltk.pos_tag([w['word'] for w in tX])\n",
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" # compare results\n",
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" n_correct = sum((1 if m2_y[i][1] == ty[i] else 0) for i in range(len(ty)))\n",
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" return n_correct / len(ty)"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"#### Model 03"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 9,
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"metadata": {},
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"outputs": [],
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"source": [
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"def model_03(corpus_tagged, corpus_sents, cut=0.8):\n",
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" \n",
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" patterns = [(r'.*ing$', 'VBG'), (r'.*ed$', 'VBD'), (r'.*es$', 'VBZ'), (r'.*ould$', 'MD'), (r'.*\\'s$', 'NN$'), \n",
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" (r'.*s$', 'NNS'), (r'^-?[0-9]+(.[0-9]+)?$', 'CD'), (r'.*', 'NN')]\n",
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" \n",
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" s = int(len(corpus_tagged) * cut)\n",
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" train_sents = corpus_tagged[:s]\n",
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" test_sents = corpus_tagged[s:]\n",
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" \n",
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" models = {\n",
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" 'def_model': nltk.DefaultTagger('NN'),\n",
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" 'regexp_model': nltk.RegexpTagger(patterns),\n",
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" 'uni_model': nltk.UnigramTagger(train_sents),\n",
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" 'bi_model': nltk.BigramTagger(train_sents),\n",
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" 'tri_model': nltk.TrigramTagger(train_sents)\n",
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" }\n",
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" \n",
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" performance = {}\n",
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" for name,model in models.items():\n",
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" performance[name] = model.evaluate(test_sents)\n",
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" \n",
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" return performance\n"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"### Applying models on Datasets"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 10,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"P1.1\n",
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"start training…\n",
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"training done\n",
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"Accuracy: 0.7712959728529368\n",
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"P1.2\n",
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"P1.3\n",
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"P1.4\n",
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"start training…\n",
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"training done\n",
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"Accuracy: 0.6410882090489463\n",
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"P1.5\n",
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"P1.6\n",
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"{'P1.1': 0.7712959728529368,\n",
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" 'P1.2': 0.8936074654423873,\n",
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" 'P1.3 -- bi_model': 0.1132791057437996,\n",
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" 'P1.3 -- def_model': 0.1447677029791906,\n",
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" 'P1.3 -- regexp_model': 0.24232746145017217,\n",
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" 'P1.3 -- tri_model': 0.06736863116922003,\n",
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" 'P1.3 -- uni_model': 0.8608213982733669,\n",
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" 'P1.4': 0.6410882090489463,\n",
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" 'P1.5': 0.6044583741861567,\n",
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" 'P1.6 -- bi_model': 0.1132791057437996,\n",
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" 'P1.6 -- def_model': 0.1447677029791906,\n",
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" 'P1.6 -- regexp_model': 0.24232746145017217,\n",
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" 'P1.6 -- tri_model': 0.06736863116922003,\n",
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" 'P1.6 -- uni_model': 0.8608213982733669}\n"
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]
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}
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],
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"source": [
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"performances = {}\n",
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"\n",
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"treebank_tagged = nltk.corpus.treebank.tagged_sents()\n",
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"treebank_sents = nltk.corpus.treebank.sents()\n",
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"\n",
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"brown_tagged = nltk.corpus.brown.tagged_sents()#(categories='news')\n",
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"brown_sents = nltk.corpus.brown.sents()#(categories='news')\n",
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"\n",
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"X1,y1,tX1,ty1 = create_training_and_test_set(annotated_sentences=treebank_tagged, \n",
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" relative_cutoff=0.8)\n",
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"\n",
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"X2,y2,tX2,ty2 = create_training_and_test_set(annotated_sentences=brown_tagged, \n",
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" relative_cutoff=0.8)\n",
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"\n",
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"\n",
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"print(\"P1.1\")\n",
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"performances['P1.1'] = model_01(X1,y1,tX1,ty1)\n",
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"\n",
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"print(\"P1.2\")\n",
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"performances['P1.2'] = model_02(tX1,ty1)\n",
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"\n",
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"print(\"P1.3\")\n",
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"p3 = model_03(treebank_tagged, treebank_sents)\n",
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"for k,v in p3.items():\n",
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" performances[\"P1.3 -- \" + k] = v\n",
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"\n",
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"print(\"P1.4\")\n",
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"performances['P1.4'] = model_01(X2,y2,tX2,ty2)\n",
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"\n",
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"print(\"P1.5\")\n",
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"performances['P1.5'] = model_02(tX2,ty2)\n",
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"\n",
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"print(\"P1.6\")\n",
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"p6 = model_03(brown_tagged, brown_sents)\n",
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"for k,v in p3.items():\n",
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" performances[\"P1.6 -- \" + k] = v\n",
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"\n",
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"pprint.pprint(performances)\n"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"### Plotting Data"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 11,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"application/vnd.jupyter.widget-view+json": {
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"model_id": "80f8a41746b340f09c5d16a3071c7384",
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"version_major": 2,
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"version_minor": 0
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},
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"text/html": [
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"<p>Failed to display Jupyter Widget of type <code>FigureCanvasNbAgg</code>.</p>\n",
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"<p>\n",
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" If you're reading this message in the Jupyter Notebook or JupyterLab Notebook, it may mean\n",
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" that the widgets JavaScript is still loading. If this message persists, it\n",
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" likely means that the widgets JavaScript library is either not installed or\n",
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" not enabled. See the <a href=\"https://ipywidgets.readthedocs.io/en/stable/user_install.html\">Jupyter\n",
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" Widgets Documentation</a> for setup instructions.\n",
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"</p>\n",
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"<p>\n",
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" If you're reading this message in another frontend (for example, a static\n",
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" rendering on GitHub or <a href=\"https://nbviewer.jupyter.org/\">NBViewer</a>),\n",
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" it may mean that your frontend doesn't currently support widgets.\n",
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"</p>\n"
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],
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"text/plain": [
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"FigureCanvasNbAgg()"
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]
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},
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"metadata": {},
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"output_type": "display_data"
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}
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],
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"source": [
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"import matplotlib.pyplot as plt\n",
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"import numpy as np\n",
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"#weights = clf.named_steps['classifier'].feature_importances_\n",
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"#labels = clf.named_steps['vectorizer'].get_feature_names()\n",
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"\n",
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"#sort\n",
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"#weights, labels = (list(t) for t in zip(*sorted(zip(weights, labels))))\n",
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"\n",
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"fig_1, ax_1 = plt.subplots()\n",
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"plt.bar(np.arange(len(performances)), performances.values())\n",
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"plt.xticks(np.arange(len(performances)), performances.keys(), rotation=30, ha='right')\n",
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"plt.tight_layout()\n",
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"plt.show()\n"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": []
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}
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],
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"metadata": {
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"kernelspec": {
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"display_name": "Python 3",
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"language": "python",
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"name": "python3"
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},
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"language_info": {
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"codemirror_mode": {
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"name": "ipython",
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"version": 3
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},
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"file_extension": ".py",
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"mimetype": "text/x-python",
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython3",
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"version": "3.6.5"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 2
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}
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