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Image Caption Generator With Transformers

This repository contains code for generating captions for images using a Transformer-based model. The model used is the VisionEncoderDecoderModel from the Hugging Face Transformers library, specifically the nlpconnect/vit-gpt2-image-captioning model.

Installation

To run this code, you'll need to install the following packages:

• Transformers
• PyTorch
• Pillow (Python Imaging Library)

Certainly! Here's an updated installation section with more detailed instructions:

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Installation

1. Clone the Repository

First, clone this repository to your local machine using Git:

git clone https://github.com/your-username/Image_Caption_Generator_With_Transformers.git

Replace your-username with your GitHub username.

2. Install Required Packages

Navigate to the cloned repository and install the required Python packages using pip:

cd Image_Caption_Generator_With_Transformers
pip install -r requirements.txt

3. Download Pre-trained Model and Tokenizer

Download the pre-trained nlpconnect/vit-gpt2-image-captioning model and tokenizer from the Hugging Face model hub using the transformers library:

python download_model.py

This will download the necessary model files and save them to the models directory.

4. Verify Installation

To verify that the installation was successful, you can run the provided example usage code:

python example_usage.py

This will generate captions for a sample image (sample.jpg) and print the captions to the console.

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Usage

1. Import the required libraries and load the pre-trained model and tokenizer:

from transformers import VisionEncoderDecoderModel, ViTFeatureExtractor, AutoTokenizer
import torch
from PIL import Image

2. Call the predict_step function with a list of image paths to generate captions:

captions = predict_step(['sample2.jpg'])
print(captions)

This will output the generated captions for the given image(s).

The provided code includes an example usage:

predict_step(['sample2.jpg'])

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Deployment

1. Prepare Your Streamlit App

Make sure your Streamlit app (app.py) is ready for deployment. Ensure that it includes all necessary dependencies and functionality.

2. Create a Requirements File

Create a requirements.txt file in your project directory listing all the dependencies needed by your Streamlit app. You can generate this file using pip freeze > requirements.txt if you're using a virtual environment.

3. Set Up a GitHub Repository

If you haven't already, set up a GitHub repository for your Streamlit app. Push your app.py and requirements.txt files to this repository.

4. Deploy on Streamlit Sharing

1. Go to Streamlit Sharing and sign in with your GitHub account.
2. Click on "New app" and select your GitHub repository.
3. Configure the settings for your app (e.g., branch, path to app.py).
4. Click on "Deploy" to deploy your Streamlit app.

5. Monitor Deployment

Streamlit will start building and deploying your app. You can monitor the deployment process in the Streamlit Sharing dashboard.

6. View Your App

Once deployed, you can access your Streamlit app using the provided URL. Share this URL with others to showcase your app.

7. Update Your App

If you make changes to your app, simply push the changes to your GitHub repository. Streamlit Sharing will automatically redeploy your app with the new changes.

8. Manage Your App

You can manage your deployed app in the Streamlit Sharing dashboard. From here, you can view logs, change settings, and monitor usage.

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Docker Deployment

# Use the official Python image as the base image
FROM python:3.9

# Set the working directory in the container
WORKDIR /app

# Copy the requirements file
COPY requirements.txt .

# Install the required packages
RUN pip install --no-cache-dir -r requirements.txt

# Copy the rest of the application code
COPY . .

# Expose the port for the Streamlit app (default is 8501)
EXPOSE 8501

# Run the Streamlit app
CMD ["streamlit", "run", "app.py"]

Here's what the different parts of the Dockerfile do:

1. FROM python:3.12: This line specifies the base image for your Docker container. In this case, we're using the official Python 3.12 image.

2. WORKDIR /app: This sets the working directory inside the container to /app.

3. COPY requirements.txt .: This copies the requirements.txt file from your local machine to the container's working directory.

4. RUN pip install --no-cache-dir -r requirements.txt: This line installs the Python packages listed in the requirements.txt file.

5. COPY . .: This copies the entire contents of your local project directory (including the Streamlit app code) to the container's working directory.

6. EXPOSE 8501: This exposes port 8501 in the container, which is the default port that Streamlit runs on.

7. CMD ["streamlit", "run", "app.py"]: This is the command that will be executed when the container starts. It runs the streamlit run app.py command to start the Streamlit app.

To build the Docker image, navigate to the directory containing the Dockerfile and run the following command:

docker build -t image-caption-generator .

This will build a Docker image with the tag image-caption-generator.

To run the container and start the Streamlit app, use the following command:

docker run -p 8501:8501 image-caption-generator

This command maps the container's port 8501 to the host's port 8501, so you can access the Streamlit app in your web browser at http://localhost:8501.

Make sure to replace app.py with the name of your Streamlit app file if it's different.

With this Dockerfile, you can easily build and run your Streamlit image caption generator app in a Docker container, ensuring a consistent and isolated environment for your application.

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