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from io import BytesIO
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import requests
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import torch
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from PIL import Image
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from torchvision.transforms import GaussianBlur
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from transformers import CLIPModel, CLIPProcessor
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class CLIPQ:
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"""
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ClipQ is an CLIQ based model that can be used to generate captions for images.
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Attributes:
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model_name (str): The name of the model to be used.
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query_text (str): The query text to be used for the model.
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Args:
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model_name (str): The name of the model to be used.
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query_text (str): The query text to be used for the model.
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"""
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def __init__(
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self,
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model_name: str = "openai/clip-vit-base-patch16",
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query_text: str = "A photo ",
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*args,
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**kwargs
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):
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self.model = CLIPModel.from_pretrained(model_name, *args, **kwargs)
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self.processor = CLIPProcessor.from_pretrained(model_name)
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self.query_text = query_text
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def fetch_image_from_url(self, url = "https://picsum.photos/800"):
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"""Fetches an image from the given url"""
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response = requests.get(url)
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if response.status_code != 200:
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raise Exception("Failed to fetch an image")
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image = Image.open(BytesIO(response.content))
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return image
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def load_image_from_path(self, path):
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"""Loads an image from the given path"""
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return Image.open(path)
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def split_image(self, image, h_splits: int = 2, v_splits: int = 2):
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"""Splits the given image into h_splits x v_splits parts"""
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width, height = image.size
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w_step, h_step = width // h_splits, height // v_splits
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slices = []
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for i in range(v_splits):
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for j in range(h_splits):
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slice = image.crop(
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(j * w_step, i * h_step, (j + 1) * w_step, (i + 1) * h_step)
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)
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slices.append(slice)
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return slices
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def get_vectors(
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self,
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image,
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h_splits: int = 2,
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v_splits: int = 2,
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):
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"""Gets the vectors for the given image"""
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slices = self.split_image(image, h_splits, v_splits)
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vectors = []
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for slice in slices:
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inputs = self.processor(
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text=self.query_text, images=slice, return_tensors="pt", padding=True
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)
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outputs = self.model(**inputs)
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vectors.append(outputs.image_embeds.squeeze().detach().numpy())
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return vectors
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def run_from_url(
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self,
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url: str = "https://picsum.photos/800",
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h_splits: int = 2,
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v_splits: int = 2,
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):
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"""Runs the model on the image fetched from the given url"""
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image = self.fetch_image_from_url(url)
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return self.get_vectors(image, h_splits, v_splits)
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def check_hard_chunking(self, quadrants):
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"""Check if the chunking is hard"""
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variances = []
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for quadrant in quadrants:
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edge_pixels = torch.cat(
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[
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quadrant[0, 1],
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quadrant[-1, :],
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]
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)
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variances.append(torch.var(edge_pixels).item())
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return variances
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def embed_whole_image(self, image):
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"""Embed the entire image"""
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inputs = self.processor(
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image,
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return_tensors="pt",
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)
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with torch.no_grad():
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outputs = self.model(**inputs)
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return outputs.image_embeds.squeeze()
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def apply_noise_reduction(self, image, kernel_size: int = 5):
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"""Implement an upscaling method to upscale the image and tiling issues"""
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blur = GaussianBlur(kernel_size)
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return blur(image)
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def run_from_path(self, path: str = None, h_splits: int = 2, v_splits: int = 2):
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"""Runs the model on the image loaded from the given path"""
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image = self.load_image_from_path(path)
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return self.get_vectors(image, h_splits, v_splits)
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def get_captions(self, image, candidate_captions):
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"""Get the best caption for the given image"""
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inputs_image = self.processor(
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images=image,
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return_tensors="pt",
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)
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inputs_text = self.processor(
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text=candidate_captions,
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images=inputs_image.pixel_values[0], # Fix the argument name
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return_tensors="pt",
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padding=True,
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truncation=True,
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)
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image_embeds = self.model(
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pixel_values=inputs_image.pixel_values[0]
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).image_embeds
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text_embeds = self.model(
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input_ids=inputs_text.input_ids, attention_mask=inputs_text.attention_mask
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).text_embeds
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# Calculate similarity between image and text
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similarities = (image_embeds @ text_embeds.T).squeeze(0)
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best_caption_index = similarities.argmax().item()
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return candidate_captions[best_caption_index]
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def get_and_concat_captions(
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self, image, candidate_captions, h_splits=2, v_splits=2
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):
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"""Get the best caption for the given image"""
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slices = self.split_image(image, h_splits, v_splits)
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captions = [self.get_captions(slice, candidate_captions) for slice in slices]
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concated_captions = "".join(captions)
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return concated_captions
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