def __call__(
self, x: Union[torch.Tensor, np.ndarray, List[Union[torch.Tensor,
np.ndarray]]]
) -> List[torch.Tensor]:
"""Prepare document data for model forwarding
Args:
x: list of images (np.array) or tensors (already resized and batched)
Returns:
list of page batches
"""
# Input type check
if isinstance(x, (np.ndarray, torch.Tensor)):
if x.ndim != 4:
raise AssertionError("expected 4D Tensor")
if isinstance(x, np.ndarray):
if x.dtype not in (np.uint8, np.float32):
raise TypeError("unsupported data type for numpy.ndarray")
x = torch.from_numpy(x.copy()).permute(0, 3, 1, 2)
elif x.dtype not in (torch.uint8, torch.float16, torch.float32):
raise TypeError("unsupported data type for torch.Tensor")
# Resizing
if x.shape[-2] != self.resize.size[0] or x.shape[
-1] != self.resize.size[1]:
x = F.resize(x,
self.resize.size,
interpolation=self.resize.interpolation)
# Data type
if x.dtype == torch.uint8: # type: ignore[union-attr]
x = x.to(dtype=torch.float32).div(255).clip(
0, 1) # type: ignore[union-attr]
else:
x = x.to(dtype=torch.float32) # type: ignore[union-attr]
batches = [x]
elif isinstance(x, list) and all(
isinstance(sample, (np.ndarray, torch.Tensor))
for sample in x):
# Sample transform (to tensor, resize)
samples = list(multithread_exec(self.sample_transforms, x))
# Batching
batches = self.batch_inputs(samples)
else:
raise TypeError(f"invalid input type: {type(x)}")
# Batch transforms (normalize)
batches = list(multithread_exec(self.normalize, batches))
return batches
def __call__(
self, x: Union[tf.Tensor, np.ndarray, List[Union[tf.Tensor,
np.ndarray]]]
) -> List[tf.Tensor]:
"""Prepare document data for model forwarding
Args:
x: list of images (np.array) or tensors (already resized and batched)
Returns:
list of page batches
"""
# Input type check
if isinstance(x, (np.ndarray, tf.Tensor)):
if x.ndim != 4:
raise AssertionError("expected 4D Tensor")
if isinstance(x, np.ndarray):
if x.dtype not in (np.uint8, np.float32):
raise TypeError("unsupported data type for numpy.ndarray")
x = tf.convert_to_tensor(x)
elif x.dtype not in (tf.uint8, tf.float16, tf.float32):
raise TypeError("unsupported data type for torch.Tensor")
# Data type & 255 division
if x.dtype == tf.uint8:
x = tf.image.convert_image_dtype(x, dtype=tf.float32)
# Resizing
if x.shape[1] != self.resize.output_size[0] or x.shape[
2] != self.resize.output_size[1]:
x = tf.image.resize(x,
self.resize.output_size,
method=self.resize.method)
batches = [x]
elif isinstance(x, list) and all(
isinstance(sample, (np.ndarray, tf.Tensor)) for sample in x):
# Sample transform (to tensor, resize)
samples = multithread_exec(self.sample_transforms, x)
# Batching
batches = self.batch_inputs(samples) # type: ignore[arg-type]
else:
raise TypeError(f"invalid input type: {type(x)}")
# Batch transforms (normalize)
batches = multithread_exec(self.normalize,
batches) # type: ignore[assignment]
return batches
def __next__(self):
if self._num_yielded < self.num_batches:
# Get next indices
idx = self._num_yielded * self.batch_size
indices = self.indices[idx: min(len(self.dataset), idx + self.batch_size)]
samples = multithread_exec(self.dataset.__getitem__, indices, threads=self.num_workers)
batch_data = self.collate_fn(samples)
self._num_yielded += 1
return batch_data
else:
raise StopIteration
def test_multithread_exec(input_seq, func, output_seq):
assert list(multithread_exec(func, input_seq)) == output_seq
assert list(multithread_exec(func, input_seq, 0)) == output_seq