Function decompress

robohusky/compression.py:197–230

Simulate group-wise dequantization.

(packed_data, config)

def decompress(packed_data, config):
    """Simulate group-wise dequantization."""
    if not config.enabled:
        return packed_data

    group_size, num_bits, group_dim, symmetric = (
        config.group_size,
        config.num_bits,
        config.group_dim,
        config.symmetric,
    )

    # Dequantize
    if symmetric:
        data, scale, original_shape = packed_data
        data = data / scale
    else:
        data, mn, scale, original_shape = packed_data
        data = data / scale
        data.add_(mn)

    # Unpad
    pad_len = (group_size - original_shape[group_dim] % group_size) % group_size
    if pad_len:
        padded_original_shape = (
            original_shape[:group_dim]
            + (original_shape[group_dim] + pad_len,)
            + original_shape[group_dim + 1 :]
        )
        data = data.reshape(padded_original_shape)
        indices = [slice(0, x) for x in original_shape]
        return data[indices].contiguous()
    else:
        return data.view(original_shape)