No negative word importance

[Faiail]

Hello, I have tried to use the clip notebook, but concering the word importance, no configuration has never output some negative importance.

I attach a sample code snipped:

img_path = "CLIP/glasses.png"
img = preprocess(Image.open(img_path)).unsqueeze(0).to(device)
texts = ["a bear"]
text = clip.tokenize(texts).to(device)

R_text, R_image = interpret(model=model, image=img, texts=text, device=device)
batch_size = text.shape[0]
for i in range(batch_size):
  show_heatmap_on_text(texts[i], text[i], R_text[i])
  show_image_relevance(R_image[i], img, orig_image=Image.open(img_path))
  plt.show()

The output is the following:

Thanks for the help :)