colors/dataloader.py

import matplotlib.colors as mcolors
import torch
from torch.utils.data import DataLoader, TensorDataset


def extract_colors():
    # Extracting the list of xkcd colors as RGB triples
    xkcd_colors = mcolors.XKCD_COLORS
    rgb_values = [mcolors.to_rgb(color) for color in xkcd_colors.values()]

    # Extracting the list of xkcd color names
    xkcd_color_names = list(xkcd_colors.keys())

    # Convert the list of RGB triples to a PyTorch tensor
    rgb_tensor = torch.tensor(rgb_values, dtype=torch.float32)
    return rgb_tensor, xkcd_color_names


def create_dataloader(N: int = 50, **kwargs):
    rgb_tensor, _ = extract_colors()
    rgb_tensor = preprocess_data(rgb_tensor)
    # Creating a dataset and data loader
    dataset = TensorDataset(rgb_tensor, torch.zeros(len(rgb_tensor)))
    train_dataloader = DataLoader(dataset, **kwargs)
    return train_dataloader


def create_gray_supplement(N: int = 50):
    linear_space = torch.linspace(0, 1, N)
    gray_tensor = linear_space.unsqueeze(1).repeat(1, 3)
    return [(gray_tensor[i], f"gray{i/N:2.4f}") for i in range(len(gray_tensor))]


def create_named_dataloader(N: int = 50, **kwargs):
    rgb_tensor, xkcd_color_names = extract_colors()
    rgb_tensor = preprocess_data(rgb_tensor)
    # Creating a dataset with RGB values and their corresponding color names
    dataset_with_names = [
        (rgb_tensor[i], xkcd_color_names[i].replace("xkcd:", ""))
        for i in range(len(rgb_tensor))
    ]
    dataset_with_names += create_gray_supplement(N)
    train_dataloader_with_names = DataLoader(dataset_with_names, **kwargs)
    return train_dataloader_with_names


def preprocess_data(data):
    # Assuming 'data' is a tensor of shape [n_samples, 3]

    # Compute argmin and argmax for each row
    argmin_values = torch.argmin(data, dim=1, keepdim=True).float()
    argmax_values = torch.argmax(data, dim=1, keepdim=True).float()

    # Normalize or scale argmin and argmax if necessary
    # For example, here I am just dividing by the number of features
    argmin_values /= data.shape[1]
    argmax_values /= data.shape[1]

    # Concatenate the argmin and argmax values to the original data
    new_data = torch.cat((data, argmin_values, argmax_values), dim=1)

    return new_data


if __name__ == "__main__":
    batch_size = 4
    train_dataloader = create_dataloader(batch_size=batch_size, shuffle=True)
    train_dataloader_with_names = create_named_dataloader(
        batch_size=batch_size, shuffle=True
    )

    # Extract a sample from the DataLoader
    sample_data = next(iter(train_dataloader))

    # Sample RGB values and their corresponding dummy labels
    sample_rgb_values, _ = sample_data

    print(sample_rgb_values)

    # Extract a sample from the new DataLoader
    sample_data_with_names = next(iter(train_dataloader_with_names))

    # Sample RGB values and their corresponding color names
    sample_rgb_values_with_names, sample_color_names = sample_data_with_names

    print(sample_rgb_values_with_names, sample_color_names)