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GPT-J: A Comprehensive Guide with Examples

GPT-J: A Comprehensive Guide with Examples

Artificial intelligence (AI) has seen rapid advancements in recent years. One such noteworthy development is GPT-J, a powerful language model that's revolutionizing the field of natural language processing (NLP). This guide aims to provide an in-depth understanding of GPT-J, explore its diverse capabilities, and illustrate how you can harness its potential with concrete code examples.

A Dive into GPT-J

GPT-J, introduced by Eleuther AI, is a 6-billion parameter model that's become a game-changer in the AI realm. While its parameter count is lower than its predecessor, OpenAI's GPT-3 (175 billion parameters), it surpasses GPT-3 in code generation tasks. This feat is possible due to the extensive training on diverse internet text, enabling it to predict subsequent text sequences. This unique ability allows it to handle various tasks including language translation, code completion, chatting, blog post writing, and more.

Practical Uses of GPT-J

Code Generation

GPT-J is exceptional at generating high-quality, functional code. Given a brief input about the program's function, it can construct the code accordingly. For example, you can prompt GPT-J to create a 4-layer convolutional neural network (CNN) for the MNIST dataset using TensorFlow, like so:

input = """
import tensorflow
# 4 layer CNN with a softmax output
# test on MNIST data set

GPT-J will then generate the rest of the code, producing a detailed program to accomplish the task.

Developing Chatbots

GPT-J can power chatbots, simulating human-like conversations effectively. By inputting the dialogue in a script-like manner, GPT-J can construct responses that maintain the context of the conversation.

Consider the following example:

input = """
User: Hello, how's the weather today?

Based on the input, GPT-J will generate a suitable response to continue the conversation.

Story Writing

GPT-J can assist in creative writing tasks as well. If you begin a story, GPT-J can continue it in a similar style, making it a useful tool for writers. Here's an example:

input = """
Once upon a time in a town far, far away...

GPT-J will then generate the subsequent part of the story, maintaining the narrative flow.

Language Translation and Information Retrieval

GPT-J's training on diverse texts, including numerous scientific articles, allows it to translate languages and retrieve specific information effectively. For example, if you want to translate a word from English to French or gather detailed information on a topic, GPT-J can assist. Here's how:

input = """
English: Hello
input = """
Quantum entanglement

GPT-J will provide the translation and the information respectively based on these inputs.

Interacting with GPT-J

GPT-J via the Browser

Eleuther AI has embedded an API for GPT-J on their web page. This user-friendly interface allows you to input text and observe how the model completes it. It also provides adjustable settings such as 'temperature', which controls the confidence level of the model,

and 'Top-P', which determines the probability distribution of the next word selection.

Access the API via this link (opens in a new tab).

Using GPT-J on Google Colab

While Eleuther AI's website offers an easy way to interact with GPT-J, it restricts the length of output text. If you want to control the output length, consider using a Google Colab notebook.

Here's a Google Colab notebook (opens in a new tab) with GPT-J installed. Once you open the notebook, run all cells up to the last one. The final cell allows you to adjust settings like 'Top-P', 'temperature', and input text. You can also set the output length according to your preference.

Running GPT-J with HuggingFace's Transformers

The Python library, transformers, provided by HuggingFace, offers a way to run GPT-J on your computer. However, be aware that this requires substantial computational resources - a NVIDIA GPU with at least 16GB of VRAM and a minimum of 16GB CPU RAM.

Here are the installation commands:

pip install tensorflow # or pytorch
pip install transformers

After installing the necessary packages, you can load the model and run the inference with the following Python code:

from transformers import GPTJForCausalLM, GPT2Tokenizer
tokenizer = GPT2Tokenizer.from_pretrained("EleutherAI/gpt-j-6B")
model = GPTJForCausalLM.from_pretrained("EleutherAI/gpt-j-6B")
prompt = "Once upon a time"
input_ids = tokenizer.encode(prompt, return_tensors="pt")
output = model.generate(input_ids, max_length=100, num_return_sequences=5)
for i in range(5):
    print(tokenizer.decode(output[i], skip_special_tokens=True))


With its powerful capabilities and varied applications, GPT-J is shaping the future of AI. Whether you're a developer, a writer, or a researcher, understanding and effectively using GPT-J can greatly amplify your work. This guide provides the necessary knowledge and tools to explore and harness the potential of GPT-J. Start experimenting today, and unlock the possibilities that this groundbreaking AI model has to offer.