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vlm-probe / examples /tutorials /attention_chefer.py

Update vlmprobe to 1.0.1 with SAE methods, guides, and technical report

31246a6 verified 9 days ago

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from pathlib import Path
import os
from io import BytesIO
from urllib.request import urlopen
import numpy as np
import torch
from PIL import Image
from transformers import AutoImageProcessor, ViTForImageClassification
from vlmprobe import Prober, ClassScore
from vlmprobe import visualization as viz
import matplotlib.pyplot as plt

# Install: pip install "vlmprobe[transformers,visualization]"
# Set VLM_PROBING_MODEL to a local directory to avoid downloading this checkpoint.
model_id = os.environ.get("VLM_PROBING_MODEL", "google/vit-base-patch16-224")
device = os.environ.get("VLM_PROBING_DEVICE", "cuda:0" if torch.cuda.is_available() else "cpu")
model = ViTForImageClassification.from_pretrained(model_id, attn_implementation="eager").to(device).eval()
processor = AutoImageProcessor.from_pretrained(os.environ.get("VLM_PROBING_PROCESSOR", model_id))
probe = Prober(model, processor)

# A raw COCO image, not a saved attention map or a previous model result.
image_path = os.environ.get("VLM_PROBING_IMAGE")
image = (Image.open(image_path) if image_path else Image.open(BytesIO(urlopen(
    "https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/coco_sample.png"
).read()))).convert("RGB")
inputs = {k: v.to(device) for k, v in processor(images=image, return_tensors="pt").items()}
with torch.no_grad():
    logits = model(**inputs).logits
    target_id = int(logits[0].argmax())  # Choose once; keep fixed during attribution.
metric = ClassScore(target_id, kind="logit")
print("Fixed target:", target_id, model.config.id2label.get(target_id))

# Plot the actual processed image; its crop/resize aligns with the patch tokens.
mean = torch.tensor(processor.image_mean)[:, None, None]
std = torch.tensor(processor.image_std)[:, None, None]
rgb = (inputs["pixel_values"][0].detach().cpu() * std + mean).clamp(0, 1)
processed_image = Image.fromarray((rgb.permute(1, 2, 0).numpy() * 255).astype("uint8"))
patch = model.config.patch_size
grid_shape = tuple(int(n // patch) for n in inputs["pixel_values"].shape[-2:])
visual_positions = list(range(1, 1 + grid_shape[0] * grid_shape[1]))  # CLS is 0.
last = probe.describe()["methods"]["attention.profile"]["sites"][-1]
output_dir = Path(os.environ.get("VLM_PROBING_OUTPUT", "outputs/attention-tutorial"))
output_dir.mkdir(parents=True, exist_ok=True)
method = probe.attention.dtd_lrp(method="transformer_attribution", start_layer=0, device=device)
result = method.run(inputs["pixel_values"], target=target_id)
print("Patch map:", result.tensors["patch_relevance"].shape)
# The converted author-rule backend must keep the native classifier predictions.
with torch.no_grad():
    native_logits = model(**inputs).logits.cpu()
torch.testing.assert_close(result.tensors["logits"], native_logits, rtol=1e-4, atol=1e-4)
ax = viz.plot_attention_overlay(
    processed_image, result, tensor="patch_relevance", image_alpha=0.25,
    signed=bool((result.tensors["patch_relevance"] < 0).any()),
    title="Chefer CVPR 2021 Transformer Attribution",
)
ax.figure.savefig(output_dir / "attention-chefer.png", dpi=160, bbox_inches="tight")
result.save(output_dir / "attention-chefer")
plt.show()

	from pathlib import Path
	import os
	from io import BytesIO
	from urllib.request import urlopen
	import numpy as np
	import torch
	from PIL import Image
	from transformers import AutoImageProcessor, ViTForImageClassification
	from vlmprobe import Prober, ClassScore
	from vlmprobe import visualization as viz
	import matplotlib.pyplot as plt

	# Install: pip install "vlmprobe[transformers,visualization]"
	# Set VLM_PROBING_MODEL to a local directory to avoid downloading this checkpoint.
	model_id = os.environ.get("VLM_PROBING_MODEL", "google/vit-base-patch16-224")
	device = os.environ.get("VLM_PROBING_DEVICE", "cuda:0" if torch.cuda.is_available() else "cpu")
	model = ViTForImageClassification.from_pretrained(model_id, attn_implementation="eager").to(device).eval()
	processor = AutoImageProcessor.from_pretrained(os.environ.get("VLM_PROBING_PROCESSOR", model_id))
	probe = Prober(model, processor)

	# A raw COCO image, not a saved attention map or a previous model result.
	image_path = os.environ.get("VLM_PROBING_IMAGE")
	image = (Image.open(image_path) if image_path else Image.open(BytesIO(urlopen(
	"https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/coco_sample.png"
	).read()))).convert("RGB")
	inputs = {k: v.to(device) for k, v in processor(images=image, return_tensors="pt").items()}
	with torch.no_grad():
	logits = model(**inputs).logits
	target_id = int(logits[0].argmax()) # Choose once; keep fixed during attribution.
	metric = ClassScore(target_id, kind="logit")
	print("Fixed target:", target_id, model.config.id2label.get(target_id))

	# Plot the actual processed image; its crop/resize aligns with the patch tokens.
	mean = torch.tensor(processor.image_mean)[:, None, None]
	std = torch.tensor(processor.image_std)[:, None, None]
	rgb = (inputs["pixel_values"][0].detach().cpu() * std + mean).clamp(0, 1)
	processed_image = Image.fromarray((rgb.permute(1, 2, 0).numpy() * 255).astype("uint8"))
	patch = model.config.patch_size
	grid_shape = tuple(int(n // patch) for n in inputs["pixel_values"].shape[-2:])
	visual_positions = list(range(1, 1 + grid_shape[0] * grid_shape[1])) # CLS is 0.
	last = probe.describe()["methods"]["attention.profile"]["sites"][-1]
	output_dir = Path(os.environ.get("VLM_PROBING_OUTPUT", "outputs/attention-tutorial"))
	output_dir.mkdir(parents=True, exist_ok=True)
	method = probe.attention.dtd_lrp(method="transformer_attribution", start_layer=0, device=device)
	result = method.run(inputs["pixel_values"], target=target_id)
	print("Patch map:", result.tensors["patch_relevance"].shape)
	# The converted author-rule backend must keep the native classifier predictions.
	with torch.no_grad():
	native_logits = model(**inputs).logits.cpu()
	torch.testing.assert_close(result.tensors["logits"], native_logits, rtol=1e-4, atol=1e-4)
	ax = viz.plot_attention_overlay(
	processed_image, result, tensor="patch_relevance", image_alpha=0.25,
	signed=bool((result.tensors["patch_relevance"] < 0).any()),
	title="Chefer CVPR 2021 Transformer Attribution",
	)
	ax.figure.savefig(output_dir / "attention-chefer.png", dpi=160, bbox_inches="tight")
	result.save(output_dir / "attention-chefer")
	plt.show()