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"""Test pytorch_quantization.utils"""
import pytest
import numpy as np

import torch
from pytorch_quantization import utils as quant_utils
from tests.fixtures import verbose

np.random.seed(12345)

# pylint:disable=missing-docstring, no-self-use

class TestQuantUtils():

    def test_reduce_amax(self):
        x_np = (np.random.rand(3, 7, 11, 13, 17) - 0.1).astype(np.float32)
        x_torch = torch.tensor(x_np)

        # Test reduce to one value
        amax_np = np.max(np.abs(x_np))
        amax_torch = quant_utils.reduce_amax(x_torch)
        np.testing.assert_array_equal(amax_np, amax_torch.cpu().numpy())

        # Test different axis
        axes = [(1, 2, 3), (0, 2, 3), (0, 3), (0, 1, 3, 4)]
        for axis in axes:
            keepdims = np.random.rand() > 0.5
            amax_np = np.max(np.abs(x_np), axis=axis, keepdims=keepdims)
            amax_torch = quant_utils.reduce_amax(x_torch, axis=axis, keepdims=keepdims)
            np.testing.assert_array_almost_equal(amax_np, amax_torch.cpu().numpy())

        with pytest.raises(ValueError) as excinfo:
            quant_utils.reduce_amax(x_torch, axis=(0, 1, 2, 3, 4, 5))
            assert "Cannot reduce more axes" in str(excinfo.value)