clip-text-decoder
Generate text captions for images from their CLIP embeddings. Includes PyTorch model code and example training script.
Example Predictions
Example captions were computed with the pretrained model mentioned below.
"A man riding a wave on top of a surfboard."
A baseball player is swinging a bat at a ball.
"A dog running across a field with a frisbee."
Installation
Install for easier access to the following objects/classes:
clip_text_decoder.datasets.ClipCocoCaptionsDatasetclip_text_decoder.models.ClipDecoderclip_text_decoder.models.ClipDecoderInferenceModelclip_text_decoder.tokenizer.Tokenizer
The train.py script will not be available in the installed package, since it's located in the root directory. To train new models, either clone this repository or recreate train.py locally.
Using pip:
pip install clip-text-decoder
From source:
git clone https://github.com/fkodom/clip-text-decoder.git
cd clip-text-decoder
pip install .
NOTE: You'll also need to install openai/CLIP to encode images with CLIP. This is also required by ClipCocoCaptionsDataset to build the captions dataset the first time (cached for subsequent calls).
pip install "clip @ git+https://github.com/openai/CLIP.git"
For technical reasons, the CLIP dependency can't be included in the PyPI package, since it's not an officially published package.
Training
Launch your own training session using the provided script (train.py):
python train.py --max-epochs 5
Training CLI arguments, along with their default values:
--max-epochs 5 # (int)
--num-layers 6 # (int)
--dim-feedforward 256 # (int)
--precision 16 # (16 or 32)
--seed 0 # (int)
Inference
The training script will produce a model.zip archive, containing the Tokenizer and trained model parameters. To perform inference with it:
import clip
from PIL import Image
import torch
from clip_text_decoder.model import ClipDecoderInferenceModel
device = "cuda" if torch.cuda.is_available() else "cpu"
model = ClipDecoderInferenceModel.load("path/to/model.zip").to(device)
clip_model, clip_preprocessor = clip.load("ViT-B/32", device=device, jit=False)
# Create a blank dummy image
dummy_image = Image.new("RGB", (224, 224))
preprocessed = clip_preprocessor(dummy_image).to(device)
# Add a batch dimension using '.unsqueeze(0)'
encoded = clip_model.encode_image(preprocessed.unsqueeze(0))
text = model(encoded)
print(text)
# Probably some nonsense, because we used a dummy image.
Pretrained Models
A pretrained CLIP decoder is hosted in my Google Drive, and can easily be downloaded by:
from clip_text_decoder.model import ClipDecoderInferenceModel
model = ClipDecoderInferenceModel.download_pretrained()
To cache the pretrained model locally, so that it's not re-downloaded each time:
model = ClipDecoderInferenceModel.download_pretrained("/path/to/model.zip")
Shortcomings
- Only works well with COCO-style images. If you go outside the distribution of COCO objects, you'll get nonsense text captions.
- Relatively short training time. Even within the COCO domain, you'll occasionally see incorrect captions. Quite a few captions will have bad grammar, repetitive descriptors, etc.
293 Dec 28, 2022
216 Dec 26, 2022
65 Dec 10, 2022
11 Jul 24, 2022
136 Dec 31, 2022
5 Dec 06, 2022
97 Nov 10, 2022
0 Aug 17, 2021
16 Dec 22, 2022
1 Dec 13, 2021
164 Dec 30, 2022
3 Jun 15, 2022
33 Dec 28, 2022
34 Nov 03, 2022
10 Nov 10, 2022
62 Dec 23, 2022
2 Jun 07, 2022
47 Dec 20, 2022
13 Dec 24, 2022
51 Dec 28, 2022