In [1]:

!pip install pandas nltk scikit-learn matplotlib wordcloud

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In [2]:

import pandas as pd
import re
import nltk
from nltk.corpus import stopwords
from nltk.stem import WordNetLemmatizer
from sklearn.feature_extraction.text import CountVectorizer
from sklearn.decomposition import LatentDirichletAllocation
import matplotlib.pyplot as plt
from wordcloud import WordCloud

In [3]:

# Download necessary NLTK packages
nltk.download('stopwords')
nltk.download('wordnet')

[nltk_data] Downloading package stopwords to
[nltk_data]     C:\Users\alixp\AppData\Roaming\nltk_data...
[nltk_data]   Package stopwords is already up-to-date!
[nltk_data] Downloading package wordnet to
[nltk_data]     C:\Users\alixp\AppData\Roaming\nltk_data...
[nltk_data]   Package wordnet is already up-to-date!

Out[3]:

True

In [4]:

# Load the data from CSV file
# DATA SOURCE: https://www.kaggle.com/datasets/fahadrehman07/voices-of-history-50-famous-speeches/
file_path = 'C:/Users/alixp/OneDrive/CODES/Python/NOTEBOOKS/50 Famous Speechs.csv'  
df = pd.read_csv(file_path, encoding='ANSI')

In [5]:

# Clean the texts
def clean_text(text):
    text = re.sub(r'\s+', ' ', text)  # Remove extra spaces
    text = re.sub(r"[^a-zA-Z]", " ", text)  # Remove non-alphabetic characters
    text = text.lower()  # Convert to lowercase
    return text

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df['Cleaned_Speech'] = df['Speech'].apply(clean_text)

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# Remove stopwords and perform lemmatization
stop_words = set(stopwords.words('english'))
lemmatizer = WordNetLemmatizer()

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def preprocess_text(text):
    words = text.split()
    words = [lemmatizer.lemmatize(word) for word in words if word not in stop_words]
    return ' '.join(words)

In [9]:

df['Preprocessed_Speech'] = df['Cleaned_Speech'].apply(preprocess_text)

In [10]:

# Vectorize the texts
vectorizer = CountVectorizer(max_df=0.9, min_df=2, stop_words='english')
dtm = vectorizer.fit_transform(df['Preprocessed_Speech'])

In [11]:

# LDA Model
lda = LatentDirichletAllocation(n_components=5, random_state=42)
lda.fit(dtm)

Out[11]:

LatentDirichletAllocation(n_components=5, random_state=42)

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LatentDirichletAllocation?Documentation for LatentDirichletAllocationiFitted

LatentDirichletAllocation(n_components=5, random_state=42)

In [12]:

# Display topics
def display_topics(model, feature_names, no_top_words):
    for topic_idx, topic in enumerate(model.components_):
        print("Topic %d:" % (topic_idx))
        print(" ".join([feature_names[i] for i in topic.argsort()[:-no_top_words - 1:-1]]))

In [13]:

no_top_words = 10
tf_feature_names = vectorizer.get_feature_names_out()
display_topics(lda, tf_feature_names, no_top_words)

Topic 0:
party shall people know fear great world day leadership general
Topic 1:
people day woman hope freedom like nation black faith let
Topic 2:
woman life human power make future law say people state
Topic 3:
war world rise like let country hope ask history million
Topic 4:
people right shall peace life men struggle freedom woman let

In [14]:

# Word Cloud Visualization
for idx, topic in enumerate(lda.components_):
    plt.figure()
    plt.imshow(WordCloud(background_color='white').fit_words(dict(zip(tf_feature_names, topic))))
    plt.axis('off')
    plt.title(f'Topic {idx}')
    plt.show()

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In [15]:

# Topic Distribution in Documents
topic_dist = lda.transform(dtm)

for i in range(len(df)):
    if i >= 10:
        break
        
    plt.figure()
    plt.bar(range(len(topic_dist[i])), topic_dist[i])
    plt.xlabel('Topic')
    plt.ylabel('Proportion')
    plt.title(f'Speech {df["Title of the Speech"][i]}')
    plt.show()

Re: Voices of History: 40 Famous Speeches

de către Alix Paulino- vineri, 14 iunie 2024, 02:34

I decided to complete the task using Python instead of R because I encountered several issues while trying to work with R. Python provided a more seamless experience for data preprocessing, topic modeling with LDA, and visualization of the results. Here is a detailed explanation of the steps I followed to achieve the analysis:

Choosing the Corpus:
I used the dataset "50 Famous Speeches.csv" for the topic modeling analysis.

Cleaning the Texts:
I cleaned the texts by removing formatting and any HTML tags to retain only the raw text.

Loading the Texts into a CSV File:
The speeches were already in a CSV file, where the first column is the document ID and the second column contains the speech content.

Text Preprocessing:
I used Python's NLTK library for text preprocessing. This involved removing stop words, performing lemmatization, and tokenizing the text. I also handled special characters to ensure the texts were properly cleaned.

Model Calculation:
I used the scikit-learn library to vectorize the texts and build the LDA model. I chose appropriate parameters for the model to identify key topics in the speeches.

Visualization of Results:
I used Matplotlib and WordCloud libraries to visualize the results. This included generating word clouds for each topic and creating a distribution of topics across the speeches using subplots to organize the charts better.

Best regards,
Alix Paulino