| import numpy as np |
| |
| import torch |
| import io |
| |
| from common_utils import TestCase, run_tests |
| import tempfile |
| |
| class Foo(torch.nn.Module): |
| def __init__(self): |
| super(Foo, self).__init__() |
| self.qscheme = torch.per_tensor_symmetric |
| |
| |
| class TestQuantizedTensor(TestCase): |
| def test_qtensor(self): |
| num_elements = 10 |
| r = torch.ones(num_elements, dtype=torch.float) |
| scale = 1.0 |
| zero_point = 2 |
| qr = torch.quantize_per_tensor(r, scale, zero_point, torch.quint8) |
| self.assertEqual(qr.q_scale(), scale) |
| self.assertEqual(qr.q_zero_point(), zero_point) |
| self.assertTrue(qr.is_quantized) |
| self.assertFalse(r.is_quantized) |
| self.assertEqual(qr.qscheme(), torch.per_tensor_affine) |
| self.assertTrue(isinstance(qr.qscheme(), torch.qscheme)) |
| # slicing and int_repr |
| int_repr = qr.int_repr() |
| for num in int_repr: |
| self.assertEqual(num, 3) |
| for num in qr[2:].int_repr(): |
| self.assertEqual(num, 3) |
| # dequantize |
| rqr = qr.dequantize() |
| for i in range(num_elements): |
| self.assertEqual(r[i], rqr[i]) |
| # Scalar Tensor |
| # item |
| r = torch.ones(1, dtype=torch.float) |
| qr = torch.quantize_per_tensor(r, scale, zero_point, torch.quint8) |
| self.assertEqual(qr.item(), 1) |
| self.assertEqual(qr[0].item(), 1) |
| # assignment |
| self.assertTrue(qr[0].is_quantized) |
| qr[0] = 11.3 # float asignment |
| self.assertEqual(qr.item(), 11) |
| x = torch.ones(1, dtype=torch.float) * 15.3 |
| # Copying from a float Tensor |
| qr[:] = x |
| self.assertEqual(qr.item(), 15) |
| # we can also print a qtensor |
| self.assertEqual(' '.join(str(qr).split()), |
| "tensor([15.], size=(1,), dtype=torch.quint8, " + |
| "quantization_scheme=torch.per_tensor_affine, " + |
| "scale=1.0, zero_point=2)") |
| empty_r = torch.ones((0, 1), dtype=torch.float) |
| empty_qr = torch.quantize_per_tensor(empty_r, scale, zero_point, torch.quint8) |
| self.assertEqual(' '.join(str(empty_qr).split()), |
| "tensor([], size=(0, 1), dtype=torch.quint8, " + |
| "quantization_scheme=torch.per_tensor_affine, " + |
| "scale=1.0, zero_point=2)") |
| |
| def test_qtensor_quant_dequant(self): |
| r = torch.rand(3, 2, dtype=torch.float) * 4 - 2 |
| scale = 0.02 |
| zero_point = 2 |
| qr = torch.quantize_per_tensor(r, scale, zero_point, torch.quint8) |
| rqr = qr.dequantize() |
| self.assertTrue(np.allclose(r.numpy(), rqr.numpy(), atol=2 / scale)) |
| |
| def test_per_channel_qtensor_creation(self): |
| numel = 10 |
| ch_axis = 0 |
| scales = torch.rand(numel) |
| zero_points = torch.randint(0, 10, size=(numel,)) |
| q = torch._empty_per_channel_affine_quantized( |
| [numel], scales=scales, zero_points=zero_points, axis=ch_axis, dtype=torch.quint8) |
| self.assertEqual(scales, q.q_per_channel_scales()) |
| self.assertEqual(zero_points, q.q_per_channel_zero_points()) |
| self.assertEqual(ch_axis, q.q_per_channel_axis()) |
| |
| # create Tensor from uint8_t Tensor, scales and zero_points |
| int_tensor = torch.randint(0, 100, size=(numel,), dtype=torch.uint8) |
| q = torch._make_per_channel_quantized_tensor(int_tensor, scales, zero_points, ch_axis) |
| self.assertEqual(int_tensor, q.int_repr()) |
| self.assertEqual(scales, q.q_per_channel_scales()) |
| self.assertEqual(zero_points, q.q_per_channel_zero_points()) |
| self.assertEqual(ch_axis, q.q_per_channel_axis()) |
| |
| def test_qtensor_creation(self): |
| scale = 0.5 |
| zero_point = 10 |
| val = 100 |
| numel = 10 |
| q = torch._empty_affine_quantized([numel], scale=scale, zero_point=zero_point, dtype=torch.quint8) |
| self.assertEqual(scale, q.q_scale()) |
| self.assertEqual(zero_point, q.q_zero_point()) |
| |
| # create Tensor from uint8_t Tensor, scale and zero_point |
| int_tensor = torch.randint(0, 100, size=(10,), dtype=torch.uint8) |
| q = torch._make_per_tensor_quantized_tensor(int_tensor, scale, zero_point) |
| self.assertEqual(int_tensor, q.int_repr()) |
| self.assertEqual(scale, q.q_scale()) |
| self.assertEqual(zero_point, q.q_zero_point()) |
| |
| # create via empty_like |
| q = torch._empty_affine_quantized([numel], scale=scale, zero_point=zero_point, dtype=torch.quint8) |
| q_el = torch.empty_like(q) |
| self.assertEqual(q.q_scale(), q_el.q_scale()) |
| self.assertEqual(q.q_zero_point(), q_el.q_zero_point()) |
| self.assertEqual(q.dtype, q_el.dtype) |
| |
| # create via empty_like but change the dtype (currently not supported) |
| with self.assertRaises(RuntimeError): |
| torch.empty_like(q, dtype=torch.qint8) |
| |
| def test_qtensor_dtypes(self): |
| r = torch.rand(3, 2, dtype=torch.float) * 4 - 2 |
| scale = 0.2 |
| zero_point = 2 |
| qr = torch.quantize_per_tensor(r, scale, zero_point, torch.qint8) |
| rqr = qr.dequantize() |
| self.assertTrue(np.allclose(r.numpy(), rqr.numpy(), atol=2 / scale)) |
| qr = torch.quantize_per_tensor(r, scale, zero_point, torch.quint8) |
| rqr = qr.dequantize() |
| self.assertTrue(np.allclose(r.numpy(), rqr.numpy(), atol=2 / scale)) |
| qr = torch.quantize_per_tensor(r, scale, zero_point, torch.qint32) |
| rqr = qr.dequantize() |
| self.assertTrue(np.allclose(r.numpy(), rqr.numpy(), atol=2 / scale)) |
| |
| def test_qtensor_quantize_per_channel(self): |
| r = torch.rand(3, 2, dtype=torch.float) * 4 - 2 |
| scales = torch.tensor([0.2, 0.03], dtype=torch.double) |
| zero_points = torch.tensor([5, 10], dtype=torch.long) |
| axis = 1 |
| |
| def quantize_c(data, scales, zero_points): |
| res = torch.empty((3, 2)) |
| quant_min, quant_max = 0, 255 |
| for i in range(3): |
| for j in range(2): |
| res[i][j] = np.clip(np.round(data[i][j] / scales[j]) + zero_points[j], quant_min, quant_max) |
| return res |
| qr = torch.quantize_per_channel(r, scales, zero_points, axis, torch.quint8) |
| rqr = qr.dequantize() |
| self.assertTrue(np.allclose(qr.int_repr(), quantize_c(r, scales, zero_points))) |
| self.assertTrue(np.allclose(r.numpy(), rqr.numpy(), atol=2 / np.min(scales.numpy()))) |
| |
| def test_qtensor_permute(self): |
| r = torch.rand(10, 30, 2, 2, dtype=torch.float) * 4 - 2 |
| scale = 0.02 |
| zero_point = 1 |
| qr = torch.quantize_per_tensor(r, scale, zero_point, torch.qint8) |
| qr = qr.transpose(0, 1) |
| rqr = qr.dequantize() |
| # compare transpose + dequantized result with orignal transposed result |
| self.assertTrue(np.allclose(r.numpy().transpose([1, 0, 2, 3]), rqr.numpy(), atol=2 / scale)) |
| |
| qr = torch.quantize_per_tensor(r, scale, zero_point, torch.qint8) |
| qr1 = qr.permute([1, 0, 2, 3]) |
| qr2 = qr.transpose(0, 1) |
| # compare int representation after transformations |
| self.assertEqual(qr1.int_repr(), qr2.int_repr()) |
| self.assertEqual(qr1.q_scale(), qr2.q_scale()) |
| self.assertEqual(qr1.q_zero_point(), qr2.q_zero_point()) |
| # compare dequantized result |
| self.assertEqual(qr1.dequantize(), qr2.dequantize()) |
| # compare permuted + dequantized result with original transposed result |
| self.assertTrue(np.allclose(qr2.dequantize().numpy(), r.numpy().transpose([1, 0, 2, 3]), atol=2 / scale)) |
| # make permuted result contiguous |
| self.assertEqual(qr2.contiguous().int_repr(), qr2.int_repr()) |
| |
| # change memory format |
| qlast = qr.contiguous(memory_format=torch.channels_last) |
| self.assertEqual(qr.stride(), list(reversed(sorted(qr.stride())))) |
| self.assertNotEqual(qlast.stride(), list(reversed(sorted(qlast.stride())))) |
| self.assertEqual(qr.int_repr(), qlast.int_repr()) |
| self.assertEqual(qr.q_scale(), qlast.q_scale()) |
| self.assertEqual(qr.q_zero_point(), qlast.q_zero_point()) |
| self.assertEqual(qlast.dequantize(), qr.dequantize()) |
| |
| def test_qtensor_per_channel_permute(self): |
| r = torch.rand(20, 10, 2, 2, dtype=torch.float) * 4 - 2 |
| scales = torch.rand(10) * 0.02 + 0.01 |
| zero_points = torch.round(torch.rand(10) * 2 - 1).to(torch.long) |
| qr = torch.quantize_per_channel(r, scales, zero_points, 1, torch.qint8) |
| |
| # we can't reorder the axis |
| with self.assertRaises(RuntimeError): |
| qr.transpose(0, 1) |
| |
| # but we can change memory format |
| qlast = qr.contiguous(memory_format=torch.channels_last) |
| self.assertEqual(qr.stride(), list(reversed(sorted(qr.stride())))) |
| self.assertNotEqual(qlast.stride(), list(reversed(sorted(qlast.stride())))) |
| self.assertEqual(qr.int_repr(), qlast.int_repr()) |
| self.assertEqual(scales, qlast.q_per_channel_scales()) |
| self.assertEqual(zero_points, qlast.q_per_channel_zero_points()) |
| self.assertEqual(1, qlast.q_per_channel_axis()) |
| self.assertEqual(qlast.dequantize(), qr.dequantize()) |
| |
| def test_qtensor_load_save(self): |
| scale = 0.2 |
| zero_point = 10 |
| r = torch.rand(15, 2, dtype=torch.float32) * 2 |
| for dtype in [torch.quint8, torch.qint8, torch.qint32]: |
| qr = torch.quantize_per_tensor(r, scale, zero_point, dtype) |
| qrv = qr[:, 1] |
| with tempfile.NamedTemporaryFile() as f: |
| # Serializing and Deserializing Tensor |
| torch.save((qr, qrv), f) |
| f.seek(0) |
| qr2, qrv2 = torch.load(f) |
| self.assertEqual(qr, qr2) |
| self.assertEqual(qrv, qrv2) |
| self.assertEqual(qr2.storage().data_ptr(), qrv2.storage().data_ptr()) |
| |
| def test_qtensor_per_channel_load_save(self): |
| r = torch.rand(20, 10, dtype=torch.float) * 4 - 2 |
| scales = torch.rand(10) * 0.02 + 0.01 |
| zero_points = torch.round(torch.rand(10) * 20 + 1).to(torch.long) |
| # quint32 is not supported yet |
| for dtype in [torch.quint8, torch.qint8]: |
| qr = torch.quantize_per_channel(r, scales, zero_points, 1, dtype) |
| with tempfile.NamedTemporaryFile() as f: |
| # Serializing and Deserializing Tensor |
| torch.save(qr, f) |
| f.seek(0) |
| qr2 = torch.load(f) |
| self.assertEqual(qr, qr2) |
| |
| def test_qtensor_copy(self): |
| scale = 0.5 |
| zero_point = 10 |
| val = 100 |
| numel = 10 |
| # copy from same scale and zero_point |
| q = torch._empty_affine_quantized([numel], scale=scale, zero_point=zero_point, dtype=torch.quint8) |
| q2 = torch._empty_affine_quantized([numel], scale=scale, zero_point=zero_point, dtype=torch.quint8) |
| q.copy_(q2) |
| self.assertEqual(q.int_repr(), q2.int_repr()) |
| self.assertEqual(q.q_scale(), q2.q_scale()) |
| self.assertEqual(q.q_zero_point(), q2.q_zero_point()) |
| # copying from different scale and zero_point |
| scale = 3.2 |
| zero_point = 5 |
| q = torch._empty_affine_quantized([numel], scale=scale, zero_point=zero_point, dtype=torch.quint8) |
| # check original scale and zero_points are set correctly |
| self.assertEqual(q.q_scale(), scale) |
| self.assertEqual(q.q_zero_point(), zero_point) |
| q.copy_(q2) |
| # check scale and zero_points has been copied |
| self.assertEqual(q, q2) |
| |
| def test_qtensor_clone(self): |
| numel = 10 |
| scale = 0.5 |
| zero_point = 10 |
| q2 = torch._empty_affine_quantized([numel], scale=scale, zero_point=zero_point, dtype=torch.quint8) |
| q = q2.clone() |
| # Check to make sure the scale and zero_point has been copied. |
| self.assertEqual(q, q2) |
| |
| def test_qtensor_view(self): |
| scale, zero_point, dtype = 1.0, 2, torch.uint8 |
| q_int = torch.randint(0, 100, [1, 2, 3], dtype=dtype) |
| q = torch._make_per_tensor_quantized_tensor(q_int, scale=scale, zero_point=zero_point) |
| q2 = q.view(1, 3, 2) |
| self.assertEqual(q.numel(), q2.numel()) |
| # testing -1 |
| self.assertEqual(q, q2.view(1, -1, 3)) |
| |
| a_int = torch.randint(0, 100, [1, 2, 3, 4], dtype=dtype) |
| a = torch._make_per_tensor_quantized_tensor(a_int, scale=scale, zero_point=zero_point) |
| b = a.transpose(1, 2) # swaps 2nd and 3rd dimension |
| c = a.view(1, 3, 2, 4) # does not change tensor layout in memory |
| self.assertEqual(b.size(), c.size()) |
| self.assertEqual(b.q_scale(), c.q_scale()) |
| self.assertEqual(b.q_zero_point(), c.q_zero_point()) |
| self.assertNotEqual(b.stride(), c.stride()) |
| # size is the same but the underlying data is different |
| self.assertNotEqual(b.int_repr(), c.int_repr()) |
| self.assertFalse(torch.equal(b, c)) |
| |
| # a case can't view non-contiguos Tensor |
| a_int = torch.randint(0, 100, [1, 2, 3, 4], dtype=dtype) |
| a = torch._make_per_tensor_quantized_tensor(a_int, scale=scale, zero_point=zero_point) |
| b = a.transpose(1, 2) # swaps 2nd and 3rd dimension |
| err_str = "view size is not compatible with input tensor's size and stride*" |
| with self.assertRaisesRegex(RuntimeError, err_str): |
| b.view(1, 4, 2, 3) |
| # view on contiguous tensor is fine |
| b.contiguous().view(1, 4, 2, 3) |
| |
| |
| def test_qtensor_reshape(self): |
| scale, zero_point, dtype = 1.0, 2, torch.uint8 |
| q_int = torch.randint(0, 100, [3, 5], dtype=dtype) |
| q = torch._make_per_tensor_quantized_tensor(q_int, scale=scale, zero_point=zero_point) |
| q2 = q.reshape([15]) |
| self.assertEqual(q.numel(), q2.numel()) |
| self.assertEqual(q2.size(), [15]) |
| # testing -1 |
| self.assertEqual(q, q2.reshape([3, -1])) |
| |
| a_int = torch.randint(0, 100, [1, 2, 3, 4], dtype=dtype) |
| a = torch._make_per_tensor_quantized_tensor(a_int, scale=scale, zero_point=zero_point) |
| b = a.transpose(1, 2) # swaps 2nd and 3rd dimension |
| c = a.reshape(1, 3, 2, 4) # does not change tensor layout |
| self.assertEqual(b.size(), c.size()) |
| self.assertEqual(b.q_scale(), c.q_scale()) |
| self.assertEqual(b.q_zero_point(), c.q_zero_point()) |
| self.assertNotEqual(b.stride(), c.stride()) |
| self.assertNotEqual(b.int_repr(), c.int_repr()) |
| self.assertFalse(torch.equal(b, c)) |
| |
| # we can use reshape for non-contiguous Tensor |
| a_int = torch.randint(0, 100, [1, 2, 3, 4], dtype=dtype) |
| a = torch._make_per_tensor_quantized_tensor(a_int, scale=scale, zero_point=zero_point) |
| b = a.transpose(1, 2) # swaps 2nd and 3rd dimension |
| c = b.reshape(1, 4, 2, 3) |
| |
| def test_qscheme_pickle(self): |
| |
| f = Foo() |
| buf = io.BytesIO() |
| torch.save(f, buf) |
| |
| buf.seek(0) |
| f2 = torch.load(buf) |
| |
| self.assertEqual(f2.qscheme, torch.per_tensor_symmetric) |
| |
| if __name__ == "__main__": |
| run_tests() |
