<jupyter_start><jupyter_text>Mount<jupyter_code>#마운트
from google.colab import drive
drive.mount('/content/drive')<jupyter_output>Mounted at /content/drive<jupyter_text>Reading Data<jupyter_code># Import the pandas package, then use the "read_csv" function to read
# the labeled training data
import pandas as pd

train =  pd.read_csv('/content/drive/MyDrive/word2vec-nlp-tutorial/labeledTrainData.tsv',
                     header=0, delimiter="\t", quoting=3)

train.shape #check data shape
train.columns.values #colum values
train.columns
#Now that you've read the training set, take a look at a few reviews:
print(train['review'][0])<jupyter_output>"With all this stuff going down at the moment with MJ i've started listening to his music, watching the odd documentary here and there, watched The Wiz and watched Moonwalker again. Maybe i just want to get a certain insight into this guy who i thought was really cool in the eighties just to maybe make up my mind whether he is guilty or innocent. Moonwalker is part biography, part feature film which i remember going to see at the cinema when it was originally released. Some of it has subtle messages about MJ's feeling towards the press and also the obvious message of drugs are bad m'kay.<br /><br />Visually impressive but of course this is all about Michael Jackson so unless you remotely like MJ in anyway then you are going to hate this and find it boring. Some may call MJ an egotist for consenting to the making of this movie BUT MJ and most of his fans would say that he made it for the fans which if true is really nice of him.<br /><br />The actual feature film bit when it finally sta[...]<jupyter_text>Data Cleaning and Text Preprocessing<jupyter_code>#Removing HTML Markup: The BeautifulSoup Package
!pip install BeautifulSoup4
#$ sudo pip install BeautifulSoup4

# Import BeautifulSoup into your workspace
from bs4 import BeautifulSoup             

# Initialize the BeautifulSoup object on a single movie review     
example1 = BeautifulSoup(train["review"][0])  

# Print the raw review and then the output of get_text(), for 
# comparison
print(train["review"][0])
print(example1.get_text())
#Calling get_text() gives you the text of the review, without tags or markup.
#To remove punctuation and numbers, we will use a package for dealing with regular expressions, called re.
import re
# Use regular expressions to do a find-and-replace
letters_only = re.sub("[^a-zA-Z]",           # The pattern to search for
                      " ",                   # The pattern to replace it with
                      example1.get_text() )  # The text to search
print(letters_only)


 #[] indicates group membership and ^ means "not"
 #the re.sub() statement above says, "Find anything that is NOT a lowercase letter (a-z) or an upper case letter (A-Z), and replace it with a space.
#We'll also convert our reviews to lower case and split them into individual words (called "tokenization" in NLP lingo)
lower_case = letters_only.lower()        # Convert to lower case
words = lower_case.split()               # Split into words
words
#Such words are called "stop words"; in English they include words such as "a", "and", "is", and "the".
import nltk
nltk.download()


  # Download text data sets, including stop words
from nltk.corpus import stopwords # Import the stop word list

print(stopwords.words("english")) 
#This will allow you to view the list of English-language stop words. To remove stop words from our movie review, do:
# Remove stop words from "words"
words = [w for w in words if not w in stopwords.words("english")]
print(words)
#Porter Stemming and Lemmatizing (both available in NLTK) would allow us to treat "messages", "message", and "messaging" as the same word, which could certainly be useful. 
#Now we have code to clean one review - but we need to clean 25,000 training reviews! To make our code reusable, let's create a function that can be called many times.

def review_to_words( raw_review ):
    # Function to convert a raw review to a string of words
    # The input is a single string (a raw movie review), and 
    # the output is a single string (a preprocessed movie review)
    #
    # 1. Remove HTML
    review_text = BeautifulSoup(raw_review).get_text() 
    #
    # 2. Remove non-letters        
    letters_only = re.sub("[^a-zA-Z]", " ", review_text) 
    #
    # 3. Convert to lower case, split into individual words
    words = letters_only.lower().split()                             
    #
    # 4. In Python, searching a set is much faster than searching
    #   a list, so convert the stop words to a set
    stops = set(stopwords.words("english"))                  
    # 
    # 5. Remove stop words
    meaningful_words = [w for w in words if not w in stops]   
    #
    # 6. Join the words back into one string separated by space, 
    # and return the result.
    return( " ".join( meaningful_words )) 
#if you call the function for a single review
clean_review = review_to_words( train["review"][0] )
print(clean_review)
# Now let's loop through and clean all of the training set at once
# Get the number of reviews based on the dataframe column size
num_reviews = train["review"].size

# Initialize an empty list to hold the clean reviews
clean_train_reviews = []

# Loop over each review; create an index i that goes from 0 to the length
# of the movie review list 
for i in range( 0, num_reviews ):
    # Call our function for each one, and add the result to the list of
    # clean reviews
    clean_train_reviews.append( review_to_words( train["review"][i] ) )
train["review"].size
#Sometimes it can be annoying to wait for a lengthy piece of code to run. 
#It can be helpful to write code so that it gives status updates.


print("Cleaning and parsing the training set movie reviews...\n")
clean_train_reviews = []
for i in range( 0, num_reviews ):
    # If the index is evenly divisible by 1000, print a message
    if( (i+1)%1000 == 0 ):
        print("Review %d of %d\n" % ( i+1, num_reviews ))                                                                  
    clean_train_reviews.append( review_to_words( train["review"][i] ))<jupyter_output>Cleaning and parsing the training set movie reviews...

Review 1000 of 25000

Review 2000 of 25000

Review 3000 of 25000

Review 4000 of 25000

Review 5000 of 25000

Review 6000 of 25000

Review 7000 of 25000

Review 8000 of 25000

Review 9000 of 25000

Review 10000 of 25000

Review 11000 of 25000

Review 12000 of 25000

Review 13000 of 25000

Review 14000 of 25000

Review 15000 of 25000

Review 16000 of 25000

Review 17000 of 25000

Review 18000 of 25000

Review 19000 of 25000

Review 20000 of 25000

Review 21000 of 25000

Review 22000 of 25000

Review 23000 of 25000

Review 24000 of 25000

Review 25000 of 25000<jupyter_text>Creating Features from a Bag of Words (Using scikit-learn)<jupyter_code>#We'll be using the feature_extraction module from scikit-learn to create bag-of-words features. 
!pip install scikit-learn
import sklearn
print("Creating the bag of words...\n")
from sklearn.feature_extraction.text import CountVectorizer

# Initialize the "CountVectorizer" object, which is scikit-learn's
# bag of words tool.  
vectorizer = CountVectorizer(analyzer = "word",   \
                             tokenizer = None,    \
                             preprocessor = None, \
                             stop_words = None,   \
                             max_features = 5000) 

# fit_transform() does two functions: First, it fits the model
# and learns the vocabulary; second, it transforms our training data
# into feature vectors. The input to fit_transform should be a list of 
# strings.
train_data_features = vectorizer.fit_transform(clean_train_reviews)

# Numpy arrays are easy to work with, so convert the result to an 
# array
train_data_features = train_data_features.toarray()
#To see what the training data array now looks like, do
print(train_data_features.shape)
#However, we wanted to write our own function for data cleaning in this tutorial to show you how it's done step by step.
#Now that the Bag of Words model is trained, let's look at the vocabulary

# Take a look at the words in the vocabulary
vocab = vectorizer.get_feature_names()
print(vocab)
#If you're interested, you can also print the counts of each word in the vocabulary
import numpy as np

# Sum up the counts of each vocabulary word
dist = np.sum(train_data_features, axis=0)

# For each, print the vocabulary word and the number of times it 
# appears in the training set
for tag, count in zip(vocab, dist):
    print(count, tag)<jupyter_output>[1;30;43m스트리밍 출력 내용이 길어서 마지막 5000줄이 삭제되었습니다.[0m
187 abandoned
125 abc
108 abilities
454 ability
1259 able
85 abraham
116 absence
83 absent
352 absolute
1485 absolutely
306 absurd
192 abuse
91 abusive
98 abysmal
297 academy
485 accent
203 accents
300 accept
130 acceptable
144 accepted
92 access
318 accident
200 accidentally
88 accompanied
124 accomplished
296 according
186 account
81 accuracy
284 accurate
123 accused
179 achieve
139 achieved
124 achievement
90 acid
971 across
1251 act
658 acted
6490 acting
3354 action
311 actions
83 activities
2389 actor
4486 actors
1219 actress
369 actresses
394 acts
793 actual
4237 actually
148 ad
302 adam
98 adams
453 adaptation
80 adaptations
154 adapted
810 add
439 added
166 adding
347 addition
337 adds
113 adequate
124 admire
621 admit
134 admittedly
101 adorable
510 adult
376 adults
100 advance
90 advanced
153 advantage
510 adventure
204 adventures
91 advertising
259 advice
90 advise
346 affair
93 affect
113 affected
104 afford
126 aforemention[...]<jupyter_text>Random Forest<jupyter_code>print("Training the random forest...")
from sklearn.ensemble import RandomForestClassifier

# Initialize a Random Forest classifier with 100 trees
forest = RandomForestClassifier(n_estimators = 100) 

# Fit the forest to the training set, using the bag of words as 
# features and the sentiment labels as the response variable
#
# This may take a few minutes to run
forest = forest.fit( train_data_features, train["sentiment"] )<jupyter_output>Training the random forest...<jupyter_text>Creating a Submission<jupyter_code># Read the test data
test = pd.read_csv("/content/drive/MyDrive/word2vec-nlp-tutorial/testData.tsv", header=0, delimiter="\t", \
                   quoting=3 )

# Verify that there are 25,000 rows and 2 columns
print(test.shape)

# Create an empty list and append the clean reviews one by one
num_reviews = len(test["review"])
clean_test_reviews = [] 

print("Cleaning and parsing the test set movie reviews...\n")

for i in range(0,num_reviews):
    if((i+1) % 1000 == 0 ):
        print("Review %d of %d\n" % (i+1, num_reviews))
    clean_review = review_to_words( test["review"][i] )
    clean_test_reviews.append( clean_review )

# Get a bag of words for the test set, and convert to a numpy array
test_data_features = vectorizer.transform(clean_test_reviews)
test_data_features = test_data_features.toarray()

# Use the random forest to make sentiment label predictions
result = forest.predict(test_data_features)

# Copy the results to a pandas dataframe with an "id" column and
# a "sentiment" column
output = pd.DataFrame( data={"id":test["id"], "sentiment":result} )

# Use pandas to write the comma-separated output file
output.to_csv( "Bag_of_Words_model.csv", index=False, quoting=3 )<jupyter_output><empty_output>