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import numpy as np


# -------------------------------------------------------------------------
# 1) util func
# -------------------------------------------------------------------------
def c_crop(image):
    width, height = image.size
    new_size = min(width, height)
    left = (width - new_size) / 2
    top = (height - new_size) / 2
    right = (width + new_size) / 2
    bottom = (height + new_size) / 2
    return image.crop((left, top, right, bottom))


def pad64(x):
    return int(np.ceil(float(x) / 64.0) * 64 - x)


def HWC3(x):
    assert x.dtype == np.uint8
    if x.ndim == 2:
        x = x[:, :, None]
    assert x.ndim == 3
    H, W, C = x.shape
    assert C == 1 or C == 3 or C == 4
    if C == 3:
        return x
    if C == 1:
        return np.concatenate([x, x, x], axis=2)
    if C == 4:
        color = x[:, :, 0:3].astype(np.float32)
        alpha = x[:, :, 3:4].astype(np.float32) / 255.0
        y = color * alpha + 255.0 * (1.0 - alpha)
        y = y.clip(0, 255).astype(np.uint8)
        return y


def print_load_warning(missing: list = None, unexpected: list = None) -> None:
    if missing is not None and unexpected is not None and len(missing) > 0 and len(unexpected) > 0:
        print(f"Got {len(missing)} missing keys:\n\t" + "\n\t".join(missing))
        print("\n" + "-" * 79 + "\n")
        print(f"Got {len(unexpected)} unexpected keys:\n\t" + "\n\t".join(unexpected))
    elif missing is not None and len(missing) > 0:
        print(f"Got {len(missing)} missing keys:\n\t" + "\n\t".join(missing))
    elif unexpected is not None and len(unexpected) > 0:
        print(f"Got {len(unexpected)} unexpected keys:\n\t" + "\n\t".join(unexpected))