def test_transfer_batch_hook():
class CustomBatch:
def __init__(self, data):
self.samples = data[0]
self.targets = data[1]
class CurrentTestModel(EvalModelTemplate):
hook_called = False
def transfer_batch_to_device(self, data, device):
self.hook_called = True
if isinstance(data, CustomBatch):
data.samples = data.samples.to(device)
data.targets = data.targets.to(device)
else:
data = super().transfer_batch_to_device(data, device)
return data
model = CurrentTestModel()
batch = CustomBatch((torch.zeros(5, 28), torch.ones(5, 1,
dtype=torch.long)))
trainer = Trainer(gpus=1)
trainer.accelerator_backend = GPUBackend(trainer)
# running .fit() would require us to implement custom data loaders, we mock the model reference instead
trainer.get_model = MagicMock(return_value=model)
batch_gpu = trainer.accelerator_backend.batch_to_device(
batch, torch.device('cuda:0'))
expected = torch.device('cuda', 0)
assert model.hook_called
assert batch_gpu.samples.device == batch_gpu.targets.device == expected
def test_non_blocking():
""" Tests that non_blocking=True only gets passed on torch.Tensor.to, but not on other objects. """
trainer = Trainer()
trainer.accelerator_backend = GPUBackend(trainer)
batch = torch.zeros(2, 3)
with patch.object(batch, 'to', wraps=batch.to) as mocked:
batch = trainer.accelerator_backend.batch_to_device(batch, torch.device('cuda:0'))
mocked.assert_called_with(torch.device('cuda', 0), non_blocking=True)
class BatchObject(object):
def to(self, *args, **kwargs):
pass
batch = BatchObject()
with patch.object(batch, 'to', wraps=batch.to) as mocked:
batch = trainer.accelerator_backend.batch_to_device(batch, torch.device('cuda:0'))
mocked.assert_called_with(torch.device('cuda', 0))
def test_single_gpu_batch_parse():
trainer = Trainer(gpus=1)
trainer.accelerator_backend = GPUBackend(trainer)
# non-transferrable types
primitive_objects = [None, {}, [], 1.0, "x", [None, 2], {"x": (1, 2), "y": None}]
for batch in primitive_objects:
data = trainer.accelerator_backend.batch_to_device(batch, torch.device('cuda:0'))
assert data == batch
# batch is just a tensor
batch = torch.rand(2, 3)
batch = trainer.accelerator_backend.batch_to_device(batch, torch.device('cuda:0'))
assert batch.device.index == 0 and batch.type() == 'torch.cuda.FloatTensor'
# tensor list
batch = [torch.rand(2, 3), torch.rand(2, 3)]
batch = trainer.accelerator_backend.batch_to_device(batch, torch.device('cuda:0'))
assert batch[0].device.index == 0 and batch[0].type() == 'torch.cuda.FloatTensor'
assert batch[1].device.index == 0 and batch[1].type() == 'torch.cuda.FloatTensor'
# tensor list of lists
batch = [[torch.rand(2, 3), torch.rand(2, 3)]]
batch = trainer.accelerator_backend.batch_to_device(batch, torch.device('cuda:0'))
assert batch[0][0].device.index == 0 and batch[0][0].type() == 'torch.cuda.FloatTensor'
assert batch[0][1].device.index == 0 and batch[0][1].type() == 'torch.cuda.FloatTensor'
# tensor dict
batch = [{'a': torch.rand(2, 3), 'b': torch.rand(2, 3)}]
batch = trainer.accelerator_backend.batch_to_device(batch, torch.device('cuda:0'))
assert batch[0]['a'].device.index == 0 and batch[0]['a'].type() == 'torch.cuda.FloatTensor'
assert batch[0]['b'].device.index == 0 and batch[0]['b'].type() == 'torch.cuda.FloatTensor'
# tuple of tensor list and list of tensor dict
batch = ([torch.rand(2, 3) for _ in range(2)],
[{'a': torch.rand(2, 3), 'b': torch.rand(2, 3)} for _ in range(2)])
batch = trainer.accelerator_backend.batch_to_device(batch, torch.device('cuda:0'))
assert batch[0][0].device.index == 0 and batch[0][0].type() == 'torch.cuda.FloatTensor'
assert batch[1][0]['a'].device.index == 0
assert batch[1][0]['a'].type() == 'torch.cuda.FloatTensor'
assert batch[1][0]['b'].device.index == 0
assert batch[1][0]['b'].type() == 'torch.cuda.FloatTensor'
# namedtuple of tensor
BatchType = namedtuple('BatchType', ['a', 'b'])
batch = [BatchType(a=torch.rand(2, 3), b=torch.rand(2, 3)) for _ in range(2)]
batch = trainer.accelerator_backend.batch_to_device(batch, torch.device('cuda:0'))
assert batch[0].a.device.index == 0
assert batch[0].a.type() == 'torch.cuda.FloatTensor'
# non-Tensor that has `.to()` defined
class CustomBatchType:
def __init__(self):
self.a = torch.rand(2, 2)
def to(self, *args, **kwargs):
self.a = self.a.to(*args, **kwargs)
return self
batch = trainer.accelerator_backend.batch_to_device(CustomBatchType(), torch.device('cuda:0'))
assert batch.a.type() == 'torch.cuda.FloatTensor'
# torchtext.data.Batch
samples = [
{'text': 'PyTorch Lightning is awesome!', 'label': 0},
{'text': 'Please make it work with torchtext', 'label': 1}
]
text_field = Field()
label_field = LabelField()
fields = {
'text': ('text', text_field),
'label': ('label', label_field)
}
examples = [Example.fromdict(sample, fields) for sample in samples]
dataset = Dataset(
examples=examples,
fields=fields.values()
)
# Batch runs field.process() that numericalizes tokens, but it requires to build dictionary first
text_field.build_vocab(dataset)
label_field.build_vocab(dataset)
batch = Batch(data=examples, dataset=dataset)
batch = trainer.accelerator_backend.batch_to_device(batch, torch.device('cuda:0'))
assert batch.text.type() == 'torch.cuda.LongTensor'
assert batch.label.type() == 'torch.cuda.LongTensor'