import os import natsort from tqdm import tqdm import torch from jax import numpy as jnp from PIL import Image as PilImage class CustomDataSet(torch.utils.data.Dataset): def __init__(self, main_dir, transform): self.main_dir = main_dir self.transform = transform all_imgs = os.listdir(main_dir) self.total_imgs = natsort.natsorted(all_imgs) def __len__(self): return len(self.total_imgs) def get_image_name(self, idx): return self.total_imgs[idx] def __getitem__(self, idx): img_loc = os.path.join(self.main_dir, self.total_imgs[idx]) image = PilImage.open(img_loc).convert("RGB") tensor_image = self.transform(image) return tensor_image def text_encoder(text, model, tokenizer): inputs = tokenizer( [text], max_length=96, truncation=True, padding="max_length", return_tensors="np", ) embedding = model.get_text_features(inputs["input_ids"], inputs["attention_mask"])[ 0 ] embedding /= jnp.linalg.norm(embedding) return jnp.expand_dims(embedding, axis=0) def image_encoder(image, model): image = image.permute(1, 2, 0).numpy() image = jnp.expand_dims(image, axis=0) #  add batch size features = model.get_image_features(image,) features /= jnp.linalg.norm(features, axis=-1, keepdims=True) return features def precompute_image_features(model, loader): image_features = [] for i, (images) in enumerate(tqdm(loader)): images = images.permute(0, 2, 3, 1).numpy() features = model.get_image_features(images,) features /= jnp.linalg.norm(features, axis=-1, keepdims=True) image_features.extend(features) return jnp.array(image_features) def find_image(text_query, model, dataset, tokenizer, image_features, n, dataset_name): zeroshot_weights = text_encoder(text_query, model, tokenizer) zeroshot_weights /= jnp.linalg.norm(zeroshot_weights) distances = jnp.dot(image_features, zeroshot_weights.reshape(-1, 1)) file_paths = [] for i in range(1, n + 1): idx = jnp.argsort(distances, axis=0)[-i, 0] if dataset_name == "Unsplash": file_paths.append("photos/" + dataset.get_image_name(idx)) elif dataset_name == "CC": file_paths.append(dataset[idx]) else: raise ValueError(f"{dataset_name} not supported here") return file_paths