Building Your Basic Language Model (LLM) with Python: A step by step Guide

Building Your Basic Language Model (LLM) with Python: A Step-by-Step Guide

Language models are essential tools in natural language processing (NLP) and text generation tasks. In this blog post, we’ll explore how to build a basic Language Model (LLM) using Python.

1. Understanding Language Models:
Language models are statistical models that learn the probabilities of word sequences in a given text corpus. They can be used for various NLP tasks, including text generation, machine translation, and sentiment analysis. In this tutorial, we’ll focus on building a basic language model that generates text based on a given input text corpus.

2. Preparing the Data:
The first step in building our language model is to prepare the data. We’ll need a text corpus to train the model on. For this example, we’ll use a sample text file containing text from various sources. You can also use your own text corpus if desired.

3. Building the Language Model:
Now, let’s write the Python code to build our basic language model. We’ll use the Markov chain model, a simple yet effective approach for text generation. Below is a breakdown of the code snippets:

import random

def build_language_model(corpus):
words = corpus.split()
word_pairs = [(words[i], words[i + 1]) for i in range(len(words) - 1)]
word_dict = {}
for word1, word2 in word_pairs:
if word1 in word_dict:
word_dict[word1] = [word2]
return word_dict

def generate_text(language_model, seed_word, length=50):
word = seed_word
text = []
for _ in range(length):
if word in language_model:
word = random.choice(language_model[word])
return ' '.join(text)

# Example usage:
corpus = "sample text corpus goes here"
language_model = build_language_model(corpus)
generated_text = generate_text(language_model, "basic", length=100)

4. Explanation of Code:
– We define a function `build_language_model` to create a dictionary of word pairs from the input corpus.
– Another function `generate_text` takes the language model dictionary, a seed word, and generates text based on the model.
– We iterate through the model to select the next word based on the probabilities learned from the corpus.


We have used the Markov chain model via Python to build a basic language model. As you continue to explore NLP and text generation, you can further enhance your language model with more advanced techniques and larger datasets.

Happy coding! #ml#machinelearning#python#techtutorial

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