A simple library to speed up CLIP inference up to 3x (K80 GPU)

It is a simple library to speed up CLIP inference up to 3x (K80 GPU)


Install clip-onnx module and requirements first. Use this trick

!pip install git+

Example in 3 steps

  1. Download CLIP image from repo
!wget -c -O CLIP.png
  1. Load standard CLIP model, image, text on cpu
import clip
from PIL import Image

# onnx cannot work with cuda
model, preprocess = clip.load("ViT-B/32", device="cpu", jit=False)
# batch first
image = preprocess("CLIP.png")).unsqueeze(0) # [1, 3, 224, 224]
text = clip.tokenize(["a diagram", "a dog", "a cat"]) # [3, 77]
  1. Create CLIP-ONNX object to convert model to onnx
from clip_onnx import clip_onnx, attention
clip.model.ResidualAttentionBlock.attention = attention

visual_path = "clip_visual.onnx"
textual_path = "clip_textual.onnx"

# ['TensorrtExecutionProvider', 'CUDAExecutionProvider', 'CPUExecutionProvider']
onnx_model = clip_onnx(model, providers=["CPUExecutionProvider"], # cpu mode
                       visual_path=visual_path, textual_path=textual_path)
onnx_model.convert2onnx(image, text, verbose=True)
  1. Use for standard CLIP API. Batch inference
image_features = onnx_model.encode_image(image)
text_features = onnx_model.encode_text(text)

logits_per_image, logits_per_text = onnx_model(image, text)
probs = logits_per_image.softmax(dim=-1).cpu().numpy()

print("Label probs:", probs)  # prints: [[0.41456965 0.29270944 0.29272085]]

Enjoy the speed


See examples folder for more details
Some parts of the code were taken from the post. Thank you neverix for this notebook.


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