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Add drop_last option to method fit of PyTorchClassifier #1883

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merged 7 commits into from
Nov 10, 2022
Merged

Add drop_last option to method fit of PyTorchClassifier #1883

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c00332d
Update method fit of PyTorchClassifier
Oct 19, 2022
58c0a82
Add drop_last option to method fit of PyTorchClassifier
Oct 19, 2022
de1e9d2
Fix line length
Oct 20, 2022
4a32eea
Add try-except
Oct 20, 2022
6e05685
Fix style checks
Oct 21, 2022
5aefcc7
Update fit methods
Oct 25, 2022
fc12c05
Update missing parameter application
Nov 2, 2022
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17 changes: 14 additions & 3 deletions art/estimators/classification/pytorch.py
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Original file line number Diff line number Diff line change
Expand Up @@ -362,6 +362,7 @@ def fit( # pylint: disable=W0221
batch_size: int = 128,
nb_epochs: int = 10,
training_mode: bool = True,
drop_last: bool = False,
**kwargs,
) -> None:
"""
Expand All @@ -373,6 +374,9 @@ def fit( # pylint: disable=W0221
:param batch_size: Size of batches.
:param nb_epochs: Number of epochs to use for training.
:param training_mode: `True` for model set to training mode and `'False` for model set to evaluation mode.
:param drop_last: Set to ``True`` to drop the last incomplete batch, if the dataset size is not divisible by the batch
size. If ``False`` and the size of dataset is not divisible by the batch size, then the last batch
will be smaller. (default: ``False``)
:param kwargs: Dictionary of framework-specific arguments. This parameter is not currently supported for PyTorch
and providing it takes no effect.
"""
Expand All @@ -392,18 +396,25 @@ def fit( # pylint: disable=W0221
# Check label shape
y_preprocessed = self.reduce_labels(y_preprocessed)

num_batch = int(np.ceil(len(x_preprocessed) / float(batch_size)))
num_batch = len(x_preprocessed) / float(batch_size)
if drop_last:
num_batch = int(np.floor(num_batch))
else:
num_batch = int(np.ceil(num_batch))
ind = np.arange(len(x_preprocessed))

x_preprocessed = torch.from_numpy(x_preprocessed).to(self._device)
y_preprocessed = torch.from_numpy(y_preprocessed).to(self._device)

# Start training
for _ in range(nb_epochs):
# Shuffle the examples
random.shuffle(ind)

# Train for one epoch
for m in range(num_batch):
i_batch = torch.from_numpy(x_preprocessed[ind[m * batch_size : (m + 1) * batch_size]]).to(self._device)
o_batch = torch.from_numpy(y_preprocessed[ind[m * batch_size : (m + 1) * batch_size]]).to(self._device)
i_batch = x_preprocessed[ind[m * batch_size : (m + 1) * batch_size]]
o_batch = y_preprocessed[ind[m * batch_size : (m + 1) * batch_size]]

# Zero the parameter gradients
self._optimizer.zero_grad()
Expand Down