import torch


def avg_color(img: torch.Tensor):
    return img.mean(dim=(1, 2)).tolist()


def mask(foreground: torch.Tensor, background: torch.Tensor, mask_tensor: torch.Tensor, threshold: float):
    mask = mask_tensor > threshold
    return torch.where(mask, foreground, background)


def add_matrix_vector(matrix: torch.Tensor, vector: torch.Tensor):
    return matrix.add(vector)