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242 lines
9.5 KiB
Python
242 lines
9.5 KiB
Python
# Lint as: python3
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# Copyright 2021 The TensorFlow Authors. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# ==============================================================================
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"""Tests for mesh utils."""
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import collections
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import dataclasses
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from typing import Sequence
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from absl import logging
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from absl.testing import absltest
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from absl.testing import parameterized
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from jax.experimental import mesh_utils
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from jax.experimental.maps import Mesh
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from jax._src import test_util
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@dataclasses.dataclass
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class MockTpuDevice:
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"""Mock TPU device for testing."""
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platform: str
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device_kind: str
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process_index: int
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coords: Sequence[int]
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core_on_chip: int
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def mock_devices(x, y, z, dev_kind, two_cores_per_chip):
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"""Hard-coded reproduction of jax.devices() output on 8x8, 4x4x4."""
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devices = []
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process_index = 0
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for k in range(z):
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for j in range(0, y, 2):
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for i in range(0, x, 2):
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# Local 2x2 subgrid of chips, with 2 cores per chip.
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host_devices = [
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MockTpuDevice('tpu', dev_kind, process_index, (i, j, k), 0),
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MockTpuDevice('tpu', dev_kind, process_index, (i, j, k), 1),
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MockTpuDevice('tpu', dev_kind, process_index, (i + 1, j, k), 0),
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MockTpuDevice('tpu', dev_kind, process_index, (i + 1, j, k), 1),
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MockTpuDevice('tpu', dev_kind, process_index, (i, j + 1, k), 0),
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MockTpuDevice('tpu', dev_kind, process_index, (i, j + 1, k), 1),
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MockTpuDevice('tpu', dev_kind, process_index, (i + 1, j + 1, k), 0),
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MockTpuDevice('tpu', dev_kind, process_index, (i + 1, j + 1, k), 1),
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]
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if two_cores_per_chip:
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# Only include core_on_chip = 0.
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host_devices = host_devices[::2]
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devices.extend(host_devices)
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# Simulate one process per host (1 host = 2x2x1 slice)
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process_index += 1
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_validate_mocked_process_indices(devices, two_cores_per_chip)
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return devices
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# If this function raises, it's a bug in the test code!
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def _validate_mocked_process_indices(devices, two_cores_per_chip):
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process_to_devices = collections.defaultdict(lambda: [])
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for d in devices:
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process_to_devices[d.process_index].append(d)
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for local_devices in process_to_devices.values():
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if two_cores_per_chip:
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# 4 devices per process
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assert len(local_devices) == 4, local_devices
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else:
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# 8 devices per process
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assert len(local_devices) == 8, local_devices
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# All devices have same z coord
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assert len(set(d.coords[2] for d in local_devices)) == 1, local_devices
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# All devices in a 2x2 subgrid
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min_coords = min(d.coords for d in local_devices)
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expected = set()
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for x, y in [(0,0), (0,1), (1,0), (1,1)]:
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expected.add((min_coords[0] + x, min_coords[1] + y, min_coords[2]))
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assert set(d.coords for d in local_devices) == expected, local_devices
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def mock_8x8_devices():
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"""Hard-coded reproduction of jax.devices() output on 8x8."""
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return mock_devices(8, 8, 1, 'TPU v3', False)
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def mock_2x2x1_devices(two_cores_per_chip):
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"""Hard-coded reproduction of jax.devices() output on 2x2x1."""
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return mock_devices(2, 2, 1, 'TPU v4', two_cores_per_chip)
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def mock_2x2x4_devices(two_cores_per_chip):
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"""Hard-coded reproduction of jax.devices() output on 2x2x4."""
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return mock_devices(2, 2, 4, 'TPU v4', two_cores_per_chip)
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def mock_4x4x4_devices(two_cores_per_chip):
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"""Hard-coded reproduction of jax.devices() output on 4x4x4."""
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return mock_devices(4, 4, 4, 'TPU v4', two_cores_per_chip)
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def mock_4x4x8_devices(two_cores_per_chip):
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"""Hard-coded reproduction of jax.devices() output on 4x4x4."""
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return mock_devices(4, 4, 8, 'TPU v4', two_cores_per_chip)
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def mock_8x8x8_devices(two_cores_per_chip):
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"""Hard-coded reproduction of jax.devices() output on 8x8x8."""
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return mock_devices(8, 8, 8, 'TPU v4', two_cores_per_chip)
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def mock_4x8x8_devices(two_cores_per_chip):
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"""Hard-coded reproduction of jax.devices() output on 4x8x8."""
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return mock_devices(4, 8, 8, 'TPU v4', two_cores_per_chip)
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def mock_4x8x16_devices(two_cores_per_chip):
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"""Hard-coded reproduction of jax.devices() output on 4x8x16."""
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return mock_devices(4, 8, 16, 'TPU v4', two_cores_per_chip)
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def mock_8x8x16_devices(two_cores_per_chip):
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"""Hard-coded reproduction of jax.devices() output on 8x8x16."""
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return mock_devices(8, 8, 16, 'TPU v4', two_cores_per_chip)
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class PartitioningTest(test_util.JaxTestCase):
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@parameterized.named_parameters(
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('2x2x1_t', mock_2x2x1_devices, True, (2, 2, 1, 1)),
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('2x2x1_f', mock_2x2x1_devices, False, (2, 2, 1, 2)),
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('8x8x16_t', mock_8x8x16_devices, True, (8, 8, 16, 1)),
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('8x8x16_f', mock_8x8x16_devices, False, (8, 8, 16, 2)),
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)
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def test_bounds_from_last_device(self, devices, two_cores_per_chip,
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expected_bounds):
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self.assertEqual(
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mesh_utils._bounds_from_last_device(devices(two_cores_per_chip)[-1]),
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expected_bounds)
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@parameterized.named_parameters(
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('4x4x4', mock_4x4x4_devices, (4, 4, 4)),
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('4x4x8', mock_4x4x8_devices, (4, 4, 8)),
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('8x8x8', mock_8x8x8_devices, (8, 8, 8)),
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('8x8x16', mock_8x8x16_devices, (8, 8, 16)),
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)
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def test_jax_devices_order_normalized(self, devices, expected_shape):
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jax_local_devices_from_process_0 = mock_2x2x1_devices(True)
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jax_devices = devices(True)
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normalized = mesh_utils._jax_devices_order_normalized(
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jax_local_devices_from_process_0, jax_devices)
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self.assertEqual(normalized.shape, expected_shape)
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x, y, z = expected_shape
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# major_to_minor: x, y, z
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for i in range(x):
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for j in range(y):
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for k in range(z):
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self.assertEqual(normalized[i, j, k].coords, (i, j, k))
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@parameterized.named_parameters(
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('2x2x1', mock_2x2x1_devices, [1, 1, 4], ((), (2,), (0, 1))),
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('2x2x4', mock_2x2x4_devices, [1, 4, 4], ((), (2,), (0, 1))),
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('4x4x4', mock_4x4x4_devices, [1, 16, 4], ((), (1, 2), (0,))),
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('4x4x8a', mock_4x4x8_devices, [1, 16, 8], ((), (0, 1), (2,))),
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('4x4x8b', mock_4x4x8_devices, [1, 8, 16], ((), (2,), (0, 1))),
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('4x4x8c', mock_4x4x8_devices, [16, 8, 1], ((0, 1), (2,), ())),
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('4x8x8', mock_4x8x8_devices, [1, 32, 8], ((), (0, 2), (1,))),
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('8x8x8', mock_8x8x8_devices, [1, 64, 8], ((), (1, 2), (0,))),
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('8x8x16', mock_8x8x16_devices, [1, 64, 16], ((), (0, 1), (2,))),
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)
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def test_create_device_mesh_for_tpu_v4(self, devices, mesh_shape,
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expected_assignment):
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jax_local_devices_from_process_0 = mock_2x2x1_devices(True)
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jax_devices = devices(True)
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physical_mesh = mesh_utils._jax_devices_order_normalized(
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jax_local_devices_from_process_0, jax_devices)
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_, assignment = mesh_utils._create_device_mesh_for_tpu_v4(
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physical_mesh, mesh_shape)
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self.assertEqual(assignment, expected_assignment)
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def _assert_contiguous_submeshes(self, global_device_mesh):
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global_mesh = Mesh(global_device_mesh, list(range(global_device_mesh.ndim)))
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max_process_index = max(d.process_index
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for d in global_device_mesh.flatten())
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for p_idx in range(max_process_index + 1):
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# Raises an error if non-contiguous
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global_mesh._local_mesh(p_idx)
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def test_create_contiguous_submeshes_for_tpu_v4(self):
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v4 = mesh_utils._TPU_V4
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process_0_devices = mock_2x2x1_devices(True)
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for topology, mesh_shapes in mesh_utils._TRANSPOSE_TRICKS.items():
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logging.vlog(1, "topology: %s", topology)
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devices = mock_devices(topology[0], topology[1], topology[2], v4,
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two_cores_per_chip=True)
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for mesh_shape in mesh_shapes:
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logging.vlog(1, " mesh_shape: %s", mesh_shape)
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mesh = mesh_utils._create_device_mesh(
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process_0_devices, devices, v4, mesh_shape,
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contiguous_submeshes=True)
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self._assert_contiguous_submeshes(mesh)
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def test_create_contiguous_submeshes_errors(self):
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process_0_devices = mock_2x2x1_devices(True)
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v4 = mesh_utils._TPU_V4
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topology = (4, 4, 8)
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mesh_shape = (1, 16, 8)
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devices = mock_devices(topology[0], topology[1], topology[2], v4,
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two_cores_per_chip=True)
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with self.assertRaisesWithLiteralMatch(
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ValueError,
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"create_device_mesh cannot create contiguous submeshes for "
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"physical mesh topology (4, 4, 8)"):
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mesh_utils._create_device_mesh(
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process_0_devices, devices, v4, mesh_shape,
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contiguous_submeshes=True)
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topology = (4, 8, 8)
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mesh_shape = (1, 128, 2)
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devices = mock_devices(topology[0], topology[1], topology[2], v4,
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two_cores_per_chip=True)
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with self.assertRaisesWithLiteralMatch(
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ValueError,
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"create_device_mesh cannot create contiguous submeshes for mesh_shape "
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"(1, 128, 2) and physical mesh topology (4, 8, 8). "
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"Available mesh_shapes: [(1, 64, 4), (1, 4, 64), (64, 4), (4, 64)]"):
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mesh_utils._create_device_mesh(
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process_0_devices, devices, v4, mesh_shape,
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contiguous_submeshes=True)
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if __name__ == '__main__':
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absltest.main()
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