HW4 [Deception]¶
STEP 1: GET THAT DATA¶
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import os
def get_data(file, path):
f=open(path+file)
data = f.read()
f.close()
return data
def get_data_from_files(path):
results = [get_data(file, path) for file in os.listdir(path)]
return results
# pos = get_data_from_files('../pos_cornell//')
# neg = get_data_from_files('../neg_cornell/')
# pos = get_data_from_files('../hw4_lie_false/')
# neg = get_data_from_files('../hw4_lie_true/')
pos = get_data_from_files('../hw4_lie_false/')
neg = get_data_from_files('../hw4_lie_true/')
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import pandas as pd
neg_df = pd.DataFrame(neg)
pos_df = pd.DataFrame(pos)
pos_df['PoN'] = 'P'
neg_df['PoN'] = 'N'
all_df = neg_df.append(pos_df)
all_df.reset_index(drop=True,inplace=True)
all_df[:5]
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STEP 2: TOKENIZE¶
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from nltk.tokenize import word_tokenize, sent_tokenize
from nltk.sentiment import SentimentAnalyzer
from nltk.sentiment.util import *
-- 2a by sentence¶
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def get_sentence_tokens(review):
return sent_tokenize(review)
all_df['sentences'] = all_df.apply(lambda x: get_sentence_tokens(x[0]), axis=1)
all_df['num_sentences'] = all_df.apply(lambda x: len(x['sentences']), axis=1)
-- 2b by word¶
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def get_tokens(sentence):
tokens = word_tokenize(sentence)
clean_tokens = [word.lower() for word in tokens if word.isalpha()]
return clean_tokens
all_df['tokens'] = all_df.apply(lambda x: get_tokens(x[0]), axis=1)
all_df['num_tokens'] = all_df.apply(lambda x: len(x['tokens']), axis=1)
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all_df[:3]
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-- 2c Remove if tokens < 1¶
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all_df = all_df.drop(all_df[all_df.num_tokens < 1].index)
all_df[:3]
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-- 3a remove english stopwords¶
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from nltk.corpus import stopwords
stop_words = set(stopwords.words("english"))
def remove_stopwords(sentence):
filtered_text = []
for word in sentence:
if word not in stop_words:
filtered_text.append(word)
return filtered_text
all_df['no_sw'] = all_df.apply(lambda x: remove_stopwords(x['tokens']),axis=1)
all_df['num_no_sw'] = all_df.apply(lambda x: len(x['no_sw']),axis=1)
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all_df[:3]
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-- 3b get stems for both tokens and no_sw¶
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from nltk.stem import PorterStemmer
def get_stems(sentence):
ps = PorterStemmer()
return [ps.stem(w) for w in sentence]
all_df['stemmed'] = all_df.apply(lambda x: get_stems(x['tokens']),axis=1)
all_df['stemmed_no_sw'] = all_df.apply(lambda x: get_stems(x['no_sw']),axis=1)
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all_df[:3]
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-- 3c get lemmas for both tokens and no_sw¶
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from nltk.stem.wordnet import WordNetLemmatizer
def get_lemmas(sentence):
lem = WordNetLemmatizer()
return [lem.lemmatize(w) for w in sentence]
all_df['lemmed'] = all_df.apply(lambda x: get_lemmas(x['tokens']),axis=1)
all_df['lemmed_no_sw'] = all_df.apply(lambda x: get_lemmas(x['no_sw']),axis=1)
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all_df[:3]
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all_df['pos'] = all_df.apply(lambda x: nltk.pos_tag(x['tokens']),axis=1)
all_df['pos_no_sw'] = all_df.apply(lambda x: nltk.pos_tag(x['no_sw']),axis=1)
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def get_pos_dict(pos_tuple):
pos_dict = {}
for t in pos_tuple:
if t[1] in pos_dict.keys():
pos_dict[t[1]] += 1
else:
pos_dict.update({t[1]: 1})
return pos_dict
all_df['pos_dict'] = all_df.apply(lambda x: get_pos_dict(x['pos']), axis=1)
all_df['pos_dict_no_sw'] = all_df.apply(lambda x: get_pos_dict(x['pos_no_sw']), axis=1)
all_df[:3]
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# def get_bow_from_tokens(df, column):
# all_column_data = ' '.join(df[column].tolist())
# all_column_fd = Counter(all_column_data.split())
# return all_column_fd
# # bow = get_bow_from_column(all_df, 'diy_cleaner')
# # bow =
from collections import Counter
all_df['bow'] = all_df.apply(lambda x: Counter(x['tokens']), axis=1)
all_df['bow_no_sw'] = all_df.apply(lambda x: Counter(x['no_sw']), axis=1)
all_df[:3]
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all_df_n = all_df[all_df['PoN'] == 'N']
all_df_p = all_df[all_df['PoN'] == 'P']
big_bow = [item for review in all_df['bow'].tolist() for item in review]
big_bow_n = [item for review in all_df_n['bow'].tolist() for item in review]
big_bow_p = [item for review in all_df_p['bow'].tolist() for item in review]
df = pd.DataFrame.from_dict(Counter(big_bow), orient='index').reset_index()
df = df.rename(columns={'index':'word', 0:'count'})
df_n = pd.DataFrame.from_dict(Counter(big_bow_n), orient='index').reset_index()
df_n = df_n.rename(columns={'index':'word', 0:'count'})
df_p = pd.DataFrame.from_dict(Counter(big_bow_p), orient='index').reset_index()
df_p = df_p.rename(columns={'index':'word', 0:'count'})
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import seaborn as sns
import matplotlib.pyplot as plt
def bar_plot(df, title):
graph = sns.barplot(y = "count", x = "word", data = df, palette = "husl")
plt.title(title)
plt.xlabel("Word")
plt.ylabel("Count")
sns.set_context("talk")
plt.xticks(rotation = 90)
return plt
print(bar_plot(df.sort_values(by=["count"], ascending=False)[:20], "Top 20 Items (ALL) Prior to Cleaning"))
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print(bar_plot(df_n.sort_values(by=["count"], ascending=False)[:20], "Top 20 Items (TRUE) Prior to Cleaning"))
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print(bar_plot(df_p.sort_values(by=["count"], ascending=False)[:20], "Top 20 Items (FALSE) Prior to Cleaning"))
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all_df_n = all_df[all_df['PoN'] == 'N']
all_df_p = all_df[all_df['PoN'] == 'P']
big_bow = [item for review in all_df['bow_no_sw'].tolist() for item in review]
big_bow_n = [item for review in all_df_n['bow_no_sw'].tolist() for item in review]
big_bow_p = [item for review in all_df_p['bow_no_sw'].tolist() for item in review]
df = pd.DataFrame.from_dict(Counter(big_bow), orient='index').reset_index()
df = df.rename(columns={'index':'word', 0:'count'})
df_n = pd.DataFrame.from_dict(Counter(big_bow_n), orient='index').reset_index()
df_n = df_n.rename(columns={'index':'word', 0:'count'})
df_p = pd.DataFrame.from_dict(Counter(big_bow_p), orient='index').reset_index()
df_p = df_p.rename(columns={'index':'word', 0:'count'})
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print(bar_plot(df.sort_values(by=["count"], ascending=False)[:20], "Top 20 Items (ALL) Prior to Cleaning"))
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print(bar_plot(df_n.sort_values(by=["count"], ascending=False)[:20], "Top 20 Items (TRUE) Stopwords Removed"))
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print(bar_plot(df_p.sort_values(by=["count"], ascending=False)[:20], "Top 20 Items (FALSE) Stopwords Removed"))
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all_df_n = all_df[all_df['PoN'] == 'N']
all_df_p = all_df[all_df['PoN'] == 'P']
big_bow = [item for review in all_df['pos_dict'].tolist() for item in review]
big_bow_n = [item for review in all_df_n['pos_dict'].tolist() for item in review]
big_bow_p = [item for review in all_df_p['pos_dict'].tolist() for item in review]
df = pd.DataFrame.from_dict(Counter(big_bow), orient='index').reset_index()
df = df.rename(columns={'index':'word', 0:'count'})
df_n = pd.DataFrame.from_dict(Counter(big_bow_n), orient='index').reset_index()
df_n = df_n.rename(columns={'index':'word', 0:'count'})
df_p = pd.DataFrame.from_dict(Counter(big_bow_p), orient='index').reset_index()
df_p = df_p.rename(columns={'index':'word', 0:'count'})
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print(bar_plot(df.sort_values(by=["count"], ascending=False)[:10], "Top 10 Items (ALL) Prior to Cleaning"))
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print(bar_plot(df_n.sort_values(by=["count"], ascending=False)[:10], "Top 10 POS (TRUE) Prior to Cleaning"))
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print(bar_plot(df_p.sort_values(by=["count"], ascending=False)[:10], "Top 10 POS (FALSE) Prior to Cleaning"))
STEP 4: TEST EXPERIMENTS!!¶
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from sklearn.model_selection import train_test_split
from sklearn.naive_bayes import GaussianNB
def get_NB(small_df, labels):
x_train, x_test, y_train, y_test = train_test_split(small_df.values, labels, test_size=0.3, random_state = 109)
gnb = GaussianNB()
gnb.fit(x_train, y_train)
y_pred = gnb.predict(x_test)
from sklearn import metrics
print("Accuracy:", metrics.accuracy_score(y_test, y_pred))
TEST 1: Parts of speech frequency distribution¶
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pos_df = pd.DataFrame(all_df['pos_dict'].tolist(), all_df['PoN'])
pos_df[:3]
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pos_df = pos_df.fillna(0).astype(int)
pos_df[:3]
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get_NB(pos_df, pos_df.index)
TEST 1b: Normalized parts of speech frequency distribution¶
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pos_df_norm = pos_df.copy()
pos_df_norm = pos_df_norm.apply(lambda x: x/x.sum(), axis=1)
pos_df_norm[:3]
pos_df_norm[1:]
test = pos_df.copy()
test['total'] = test.sum(axis = 1)
test[:3]
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pos_df_norm[:3]
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get_NB(pos_df_norm, pos_df.index)
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# small_df
small_df = pos_df_norm.filter(['PRP', 'PRP$','NN'])
get_NB(small_df, pos_df.index)
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pos_df_n = pos_df[pos_df.index == 'N']
pos_df_p = pos_df[pos_df.index == 'P']
print(pos_df['PRP'].sum())
print(pos_df_n['PRP'].sum())
print(pos_df_p['PRP'].sum())
print(pos_df_n['PRP'].sum()/pos_df['PRP'].sum())
print(pos_df_p['PRP'].sum()/pos_df['PRP'].sum())
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pos_df_n = pos_df[pos_df.index == 'N']
pos_df_p = pos_df[pos_df.index == 'P']
print(pos_df['PRP$'].sum())
print(pos_df_n['PRP$'].sum())
print(pos_df_p['PRP$'].sum())
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pos_df_n = pos_df_norm[pos_df_norm.index == 'N']
pos_df_p = pos_df_norm[pos_df_norm.index == 'P']
print(pos_df_norm['PRP'].sum())
print(pos_df_n['PRP'].sum())
print(pos_df_p['PRP'].sum())
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pos_df_n = pos_df_norm[pos_df_norm.index == 'N']
pos_df_p = pos_df_norm[pos_df_norm.index == 'P']
print(pos_df_norm['PRP'].mean())
print(pos_df_n['PRP'].mean())
print(pos_df_p['PRP'].mean())
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pos_df_n = pos_df_norm[pos_df_norm.index == 'N']
pos_df_p = pos_df_norm[pos_df_norm.index == 'P']
print(pos_df_norm['PRP$'].mean())
print(pos_df_n['PRP$'].mean())
print(pos_df_p['PRP$'].mean())
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all_df['pos']
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all_df['pos_sent'] = all_df.apply(lambda x: [word[1] for word in x['pos']], axis=1)
all_df['pos_sent_str'] = all_df.apply(lambda x: [' '.join(x['pos_sent'])], axis=1)
all_df['pos_no_sw_sent'] = all_df.apply(lambda x: [word[1] for word in x['pos_no_sw']], axis=1)
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type(all_df['pos_sent_str'][1])
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all_df['pos_sent_bi'] = all_df.apply(lambda x: [b for l in x['pos_sent_str'] for b in zip(l.split(" ")[:-1], l.split(" ")[1:])], axis=1)
# bigrams = [b for l in text for b in zip(l.split(" ")[:-1], l.split(" ")[1:])]
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# all_df['pos_sent_tri'] = all_df.apply(lambda x: [b for l in x['pos_sent_str'] for b in zip(l.split(" ")[:-1], l.split(" ")[1:])], axis=1)
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all_df[:4]
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test = all_df['pos_sent_str'][1]
test
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text = ["this is a sentence", "so is this one"]
test2 = ["NN NNS VBP JJ JJ NN NN CC JJ NN JJ VBZ DT NN VBZ RB JJ RB CC JJ VB JJ TO VB DT NN TO VB NN IN RB RB IN", "PRP VBP VBN IN DT JJ NNS DT NN VBP JJ IN PRP$ NNS CC NN TO VB NN NN"]
test1 = ['NN NNS VBP JJ JJ NN NN CC JJ NN JJ VBZ DT NN VBZ RB JJ RB CC JJ VB JJ TO VB DT NN TO VB NN IN RB RB IN PRP VBP VBN IN DT JJ NNS DT NN VBP JJ IN PRP$ NNS CC NN TO VB NN NN']
bigrams = [b for l in test1 for b in zip(l.split(" ")[:-1], l.split(" ")[1:])]
print(bigrams)
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# all_bigrams = [bigram for bigram in all_df.pos_sent_bi.tolist()]
# flat_list = [item for sublist in l for item in sublist]
all_df_n = all_df[all_df['PoN'] == 'N']
all_df_p = all_df[all_df['PoN'] == 'P']
all_bigrams = [bigram for sublist in all_df.pos_sent_bi.tolist() for bigram in sublist]
all_bigrams_n = [bigram for sublist in all_df_n.pos_sent_bi.tolist() for bigram in sublist]
all_bigrams_p = [bigram for sublist in all_df_p.pos_sent_bi.tolist() for bigram in sublist]
all_bigrams[:5]
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count = Counter(all_bigrams)
count_n = Counter(all_bigrams_n)
count_p = Counter(all_bigrams_p)
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count.most_common()[:5]
import numpy as np
# all_df['bow_v3'] = all_df.apply(lambda x: Counter(casual_tokenize(x['pruned'])), axis=1)
# new_df = pd.DataFrame(all_df['bow_v3'].tolist(), all_df['PoN'])
# most_common_pos = [word[0] for word in big_bow_p.most_common(100)]
# print("Unique values in array1 that are not in array2:")
most_common_n = [word[0] for word in count_n.most_common(10)]
most_common_p = [word[0] for word in count_p.most_common(10)]
neg_notpos = np.setdiff1d(most_common_n, most_common_p)
neg_notpos
# all_bigrams_n
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In [54]:
all_df_n = all_df[all_df['PoN'] == 'N']
all_df_p = all_df[all_df['PoN'] == 'P']
big_bow = [item for review in all_df['pos_sent_bi'].tolist() for item in review]
big_bow_n = [item for review in all_df_n['pos_sent_bi'].tolist() for item in review]
big_bow_p = [item for review in all_df_p['pos_sent_bi'].tolist() for item in review]
df = pd.DataFrame.from_dict(Counter(big_bow), orient='index').reset_index()
df = df.rename(columns={'index':'word', 0:'count'})
df_n = pd.DataFrame.from_dict(Counter(big_bow_n), orient='index').reset_index()
df_n = df_n.rename(columns={'index':'word', 0:'count'})
df_p = pd.DataFrame.from_dict(Counter(big_bow_p), orient='index').reset_index()
df_p = df_p.rename(columns={'index':'word', 0:'count'})
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print(bar_plot(df_p.sort_values(by=["count"], ascending=False)[:10], "Top 10 POS Bigrams (ALL)"))
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print(bar_plot(df_n.sort_values(by=["count"], ascending=False)[:10], "Top 10 POS Bigrams (TRUE)"))
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print(bar_plot(df_p.sort_values(by=["count"], ascending=False)[:10], "Top 10 POS Bigrams (FALSE)"))
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all_df['bow_pos'] = all_df.apply(lambda x: Counter(x['pos_sent_bi']), axis=1)
new_df = pd.DataFrame(all_df['bow_pos'].tolist(), all_df['PoN'])
new_df = new_df.fillna(0).astype(int)
new_df[:5]
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get_NB(new_df, new_df.index)
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bi_df_norm = new_df.copy()
bi_df_norm = bi_df_norm.apply(lambda x: x/x.sum(), axis=1)
# bi_df_norm = bi_df_norm.apply(lambda x: x/x.sum(), axis=1)
bi_df_norm
get_NB(bi_df_norm, bi_df_norm.index)
bi_df_norm
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df_p.sort_values(by=["count"], ascending=False)[:20]
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df_n.sort_values(by=["count"], ascending=False)[:20]
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from nltk import word_tokenize
from nltk.util import ngrams
text = ['cant railway station', 'citadel hotel', 'police stn']
def get_ngram(line, num):
token = nltk.word_tokenize(line)
grams = list(ngrams(token, num))
return(grams)
# all_df['trigrams'] = all_df.apply(lambda x: get_ngram(x[0],3), axis=1)
all_df['trigrams'] = all_df.apply(lambda x: get_ngram(' '.join(x['tokens']),3), axis=1)
all_df['trigrams_pos'] = all_df.apply(lambda x: get_ngram(' '.join(x['pos_sent']),3), axis=1)
# ' '.join(all_df['tokens'][1])
# counter = all_df['trigrams_pos']
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all_df['trigrams_feats'] = all_df.apply(lambda x: ['_'.join(trigram) for trigram in x['trigrams_pos']], axis=1)
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def flatten_column(df, column):
return [features for row in df[column].tolist() for features in row]
# [bigram for sublist in all_df_n.pos_sent_bi.tolist() for bigram in sublist]
flat_trigrams = Counter(flatten_column(all_df, 'trigrams_feats'))
flat_trigrams_n = Counter(flatten_column(all_df[all_df['PoN'] == 'N'], 'trigrams_feats'))
flat_trigrams_p = Counter(flatten_column(all_df[all_df['PoN'] == 'P'], 'trigrams_feats'))
most_common_n = [word[0] for word in flat_trigrams_n.most_common(10)]
most_common_p = [word[0] for word in flat_trigrams_p.most_common(10)]
neg_notpos = np.setdiff1d(most_common_n, most_common_p)
neg_notpos
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all_df['trigrams_feats_bow'] = all_df.apply(lambda x: Counter(x['trigrams_feats']), axis=1)
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new_df = pd.DataFrame(all_df['trigrams_feats_bow'].tolist(), all_df['PoN'])
new_df = new_df.fillna(0).astype(int)
new_df[:5]
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get_NB(new_df, new_df.index)
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tri_df_norm = new_df.copy()
tri_df_norm = tri_df_norm.apply(lambda x: x/x.sum(), axis=1)
tri_df_norm
get_NB(tri_df_norm, tri_df_norm.index)
tri_df_norm
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all_df
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