Fix VISSL on GPU and add VISSL GPU CI

.azure-pipelines/gpu-example-tests.yml

@@ -12,7 +12,8 @@ jobs:
   parameters:
     configs:
     - "image"
-    - "image,image_extras"
+    - "icevision"
+    - "vissl"
     - "text"
     - "tabular"
     - "video"

.azure-pipelines/testing-template.yml

@@ -36,7 +36,7 @@ jobs:
 
       - bash: |
           # python -m pip install "pip==20.1"
-          if [ "${{config}}" == "image,image_extras" ]; then pip install '.[image]' icevision effdet icedata; else pip install '.[${{config}}]'; fi
+          if [ "${{config}}" == "icevision" ]; then pip install '.[image]' icevision effdet icedata; elif [ "${{config}}" == "vissl" ]; then pip install '.[image]'; else pip install '.[${{config}}]'; fi
           pip install '.[test]' --upgrade-strategy only-if-needed
           pip list
         displayName: 'Install dependencies'
@@ -46,11 +46,18 @@ jobs:
           pip uninstall -y opencv-python-headless
           pip install opencv-python-headless==4.5.5.64
         displayName: 'Install OpenCV dependencies'
-        condition: eq('${{ config }}', 'image,image_extras')
+        condition: eq('${{ config }}', 'icevision')
+
+      - bash: |
+          pip install fairscale
+          pip install git+https://github.com/facebookresearch/ClassyVision.git
+          pip install git+https://github.com/facebookresearch/vissl.git
+        displayName: 'Install VISSL dependencies'
+        condition: eq('${{ config }}', 'vissl')
 
       - bash: |
           python -c "import torch; print(f'found GPUs: {torch.cuda.device_count()}')"
-          python -m coverage run --source flash -m pytest tests/examples/test_scripts.py -v --junitxml=$(Build.StagingDirectory)/test-results.xml --durations=30
+          python -m coverage run --source flash -m pytest tests/examples/test_scripts.py tests/image/embedding/test_model.py -v --junitxml=$(Build.StagingDirectory)/test-results.xml --durations=30
         env:
           CUDA_VISIBLE_DEVICES: ${{gids}}
           FLASH_TEST_TOPIC: ${{ config }}

CHANGELOG.md

@@ -20,6 +20,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 ### Fixed
 
+- Fixed GPU support for self-supervised training with the `ImageEmbedder` ([#1256](https://github.com/PyTorchLightning/lightning-flash/pull/1256))
+
 - Fixed a bug where collate functions were never called in the `ImageEmbedder` class. ([#1217](https://github.com/PyTorchLightning/lightning-flash/pull/1217))
 
 - Fixed a bug where `pretraining_transforms` in the `ImageEmbedder` was never called. ([#1196](https://github.com/PyTorchLightning/lightning-flash/pull/1196))

docs/source/reference/image_embedder.rst

@@ -4,6 +4,10 @@
    :image: https://pl-flash-data.s3.amazonaws.com/assets/thumbnails/image_embedder.svg
    :tags: Image,Embedding
 
+.. warning::
+
+   Multi-gpu training is not currently supported by the :class:`~flash.image.embedding.model.ImageEmbedder` task.
+
 .. _image_embedder:
 
 ##############
@@ -17,7 +21,9 @@ The Task
 Image embedding encodes an image into a vector of features which can be used for a downstream task.
 This could include: clustering, similarity search, or classification.
 
+The Flash :class:`~flash.image.embedding.model.ImageEmbedder` can be trained with Self Supervised Learning (SSL) to improve the quality of the embeddings it produces for your data.
 The :class:`~flash.image.embedding.model.ImageEmbedder` internally relies on `VISSL <https://vissl.ai/>`_.
+You can read more about our integration with VISSL here: :ref:`vissl`.
 
 ------
 
@@ -26,18 +32,29 @@ Example
 *******
 
 Let's see how to configure a training strategy for the :class:`~flash.image.embedding.model.ImageEmbedder` task.
-A vanilla :class:`~flash.core.data.data_module.DataModule` object be created using standard Datasets as shown below.
-Then the user can configure the :class:`~flash.image.embedding.model.ImageEmbedder` task with ``training_strategy``, ``backbone``, ``head`` and ``pretraining_transform``.
-There are options provided to send additional arguments to config selections.
-This task can now be sent to the ``fit()`` method of :class:`~flash.core.trainer.Trainer`.
-
-.. note::
-
-   A lot of VISSL loss functions use hard-coded ``torch.distributed`` methods. The user is suggested to use ``accelerator=ddp`` even with a single GPU.
-   Only ``barlow_twins`` training strategy works on the CPU. All other loss functions are configured to work on GPUs.
+First we create an :class:`~flash.image.classification.data.ImageClassificationData` object using a `Dataset` from torchvision.
+Next, we configure the :class:`~flash.image.embedding.model.ImageEmbedder` task with ``training_strategy``, ``backbone``, ``head`` and ``pretraining_transform``.
+Finally, we construct a :class:`~flash.core.trainer.Trainer` and call ``fit()``.
+Here's the full example:
 
 .. literalinclude:: ../../../flash_examples/image_embedder.py
     :language: python
     :lines: 14-
 
 To learn how to view the available backbones / heads for this task, see :ref:`backbones_heads`.
+You can view the available training strategies with the :meth:`~flash.image.embedding.model.ImageEmbedder.available_training_strategies` method.
+
+.. note::
+
+    The ``"dino"`` training strategy only supports single GPU training with ``strategy="DDP"``.
+
+The ``head`` and ``pretraining_transform`` arguments should match the choice of ``training_strategy`` following this table:
+
+=====================  ================  ==========================
+``training_strategy``  ``head``          ``pretraining_transform``
+=====================  ================  ==========================
+``simclr``             ``simclr_head``   ``simclr_transform``
+``barlow_twins``       ``barlow_twins``  ``barlow_twins_transform``
+``swav``               ``swav_head``     ``swav_transform``
+``dino``               ``dino_head``     ``dino_transform``
+=====================  ================  ==========================

flash/core/utilities/imports.py

@@ -291,7 +291,7 @@ def _import_module(self):
 if "FLASH_TEST_TOPIC" in os.environ:
     topic = os.environ["FLASH_TEST_TOPIC"]
     _IMAGE_TESTING = topic == "image"
-    _IMAGE_EXTRAS_TESTING = topic == "image,image_extras"
+    _IMAGE_EXTRAS_TESTING = topic == "image,image_extras" or topic == "icevision" or topic == "vissl"
     _VIDEO_TESTING = topic == "video"
     _VIDEO_EXTRAS_TESTING = topic == "video,video_extras"
     _TABULAR_TESTING = topic == "tabular"

flash/image/embedding/model.py

@@ -18,21 +18,24 @@
 from flash.core.registry import FlashRegistry
 from flash.core.utilities.imports import _VISSL_AVAILABLE, requires
 from flash.core.utilities.types import LR_SCHEDULER_TYPE, OPTIMIZER_TYPE
+from flash.image.embedding.backbones import IMAGE_EMBEDDER_BACKBONES
+from flash.image.embedding.strategies import IMAGE_EMBEDDER_STRATEGIES
+from flash.image.embedding.transforms import IMAGE_EMBEDDER_TRANSFORMS
 
 if _VISSL_AVAILABLE:
     import classy_vision
     import classy_vision.generic.distributed_util
 
-    from flash.image.embedding.backbones import IMAGE_EMBEDDER_BACKBONES
-    from flash.image.embedding.strategies import IMAGE_EMBEDDER_STRATEGIES
-    from flash.image.embedding.transforms import IMAGE_EMBEDDER_TRANSFORMS
-
     # patch this to avoid classy vision/vissl based distributed training
     classy_vision.generic.distributed_util.get_world_size = lambda: 1
-else:
-    IMAGE_EMBEDDER_BACKBONES = FlashRegistry("backbones")
-    IMAGE_EMBEDDER_STRATEGIES = FlashRegistry("embedder_training_strategies")
-    IMAGE_EMBEDDER_TRANSFORMS = FlashRegistry("embedder_transforms")
+
+# Skip doctests if requirements aren't available
+__doctest_skip__ = []
+if not _VISSL_AVAILABLE:
+    __doctest_skip__ += [
+        "ImageEmbedder",
+        "ImageEmbedder.*",
+    ]
 
 
 class ImageEmbedder(AdapterTask):
@@ -130,6 +133,18 @@ def on_train_batch_end(self, outputs: Any, batch: Any, batch_idx: int, dataloade
     @classmethod
     @requires(["image", "vissl", "fairscale"])
     def available_training_strategies(cls) -> List[str]:
+        """Get the list of available training strategies (passed to the ``training_strategy`` argument) for this
+        task.
+
+        Examples
+        ________
+
+        .. doctest::
+
+            >>> from flash.image import ImageEmbedder
+            >>> ImageEmbedder.available_training_strategies()  # doctest: +ELLIPSIS +NORMALIZE_WHITESPACE
+            ['barlow_twins', ..., 'swav']
+        """
         registry: Optional[FlashRegistry] = getattr(cls, "training_strategies", None)
         if registry is None:
             return []

flash/image/embedding/vissl/adapter.py

@@ -51,6 +51,9 @@ def __init__(self, vissl_adapter, vissl_loss, task_config, vissl_model) -> None:
         # set for momentum teacher based hooks
         self.last_batch = AttrDict({"sample": AttrDict({"input": None, "data_momentum": None})})
 
+        # used in dino
+        self.additional_log_data = {}
+
 
 class VISSLAdapter(Adapter, AdaptVISSLHooks):
     """The ``VISSLAdapter`` is an :class:`~flash.core.adapter.Adapter` for integrating with VISSL.

flash/image/embedding/vissl/hooks.py

@@ -81,6 +81,9 @@ def on_start(self, task: "flash.image.embedding.vissl.adapter.MockVISSLTask") ->
 
         task.loss.info_criterion.precompute_pos_neg_mask()
 
+        # Cast the loss to the correct device / dtype
+        task.loss.to(task.vissl_adapter.adapter_task.device, task.vissl_adapter.adapter_task.dtype)
+
 
 class AdaptVISSLHooks(ModelHooks):
     def __init__(self, hooks: List[ClassyHook], task) -> None:

flash_examples/image_embedder.py

@@ -21,23 +21,21 @@
 # 1. Download the data and prepare the datamodule
 datamodule = ImageClassificationData.from_datasets(
     train_dataset=CIFAR10(".", download=True),
-    batch_size=16,
+    batch_size=4,
 )
 
 # 2. Build the task
 embedder = ImageEmbedder(
-    backbone="resnet",
+    backbone="vision_transformer",
     training_strategy="barlow_twins",
     head="barlow_twins_head",
     pretraining_transform="barlow_twins_transform",
     training_strategy_kwargs={"latent_embedding_dim": 128},
-    pretraining_transform_kwargs={"size_crops": [196]},
+    pretraining_transform_kwargs={"size_crops": [32]},
 )
 
 # 3. Create the trainer and pre-train the encoder
-# use accelerator='ddp' when using GPU(s),
-# i.e. flash.Trainer(max_epochs=3, gpus=1, accelerator='ddp')
-trainer = flash.Trainer(max_epochs=3, gpus=torch.cuda.device_count())
+trainer = flash.Trainer(max_epochs=1, gpus=torch.cuda.device_count())
 trainer.fit(embedder, datamodule=datamodule)
 
 # 4. Save the model!
@@ -50,7 +48,8 @@
     predict_files=[
         "data/hymenoptera_data/predict/153783656_85f9c3ac70.jpg",
         "data/hymenoptera_data/predict/2039585088_c6f47c592e.jpg",
-    ]
+    ],
+    batch_size=3,
 )
 embeddings = trainer.predict(embedder, datamodule=datamodule)
 

tests/examples/test_scripts.py

@@ -29,9 +29,10 @@
     _TABULAR_TESTING,
     _TEXT_TESTING,
     _VIDEO_TESTING,
+    _VISSL_AVAILABLE,
 )
 from tests.examples.utils import run_test
-from tests.helpers.forked import forked
+from tests.helpers.decorators import forked
 
 root = Path(__file__).parent.parent.parent
 
@@ -56,6 +57,15 @@
             "image_classification_multi_label.py",
             marks=pytest.mark.skipif(not _IMAGE_TESTING, reason="image libraries aren't installed"),
         ),
+        pytest.param(
+            "image_embedder.py",
+            marks=[
+                pytest.mark.skipif(
+                    not (_IMAGE_AVAILABLE and _VISSL_AVAILABLE), reason="image libraries aren't installed"
+                ),
+                pytest.mark.skipif(torch.cuda.device_count() > 1, reason="VISSL integration doesn't support multi-GPU"),
+            ],
+        ),
         pytest.param(
             "object_detection.py",
             marks=pytest.mark.skipif(
@@ -74,7 +84,6 @@
                 not (_IMAGE_AVAILABLE and _ICEVISION_AVAILABLE), reason="image libraries aren't installed"
             ),
         ),
-        # pytest.param("finetuning", "object_detection.py"),  # TODO: takes too long.
         pytest.param(
             "question_answering.py",
             marks=pytest.mark.skipif(not _TEXT_TESTING, reason="text libraries aren't installed"),

tests/image/embedding/test_model.py

@@ -17,7 +17,12 @@
 import torch
 
 import flash
-from flash.core.utilities.imports import _IMAGE_AVAILABLE, _TORCHVISION_AVAILABLE, _VISSL_AVAILABLE
+from flash.core.utilities.imports import (
+    _IMAGE_AVAILABLE,
+    _PL_GREATER_EQUAL_1_5_0,
+    _TORCHVISION_AVAILABLE,
+    _VISSL_AVAILABLE,
+)
 from flash.image import ImageClassificationData, ImageEmbedder
 
 if _TORCHVISION_AVAILABLE:
@@ -50,6 +55,7 @@ def test_load_from_checkpoint_dependency_error():
         ImageEmbedder.load_from_checkpoint("not_a_real_checkpoint.pt")
 
 
+@pytest.mark.skipif(torch.cuda.device_count() > 1, reason="VISSL integration doesn't support multi-GPU")
 @pytest.mark.skipif(not (_TORCHVISION_AVAILABLE and _VISSL_AVAILABLE), reason="vissl not installed.")
 @pytest.mark.parametrize(
     "backbone, training_strategy, head, pretraining_transform",
@@ -70,7 +76,7 @@ def test_vissl_training(backbone, training_strategy, head, pretraining_transform
     # moco strategy, transform and head is not added for this test as it doesn't work as of now.
     datamodule = ImageClassificationData.from_datasets(
         train_dataset=FakeData(16),
-        predict_dataset=FakeData(4),
+        predict_dataset=FakeData(8),
         batch_size=4,
     )
 
@@ -81,7 +87,22 @@ def test_vissl_training(backbone, training_strategy, head, pretraining_transform
         pretraining_transform=pretraining_transform,
     )
 
-    trainer = flash.Trainer(max_steps=3, max_epochs=1, gpus=torch.cuda.device_count())
+    kwargs = {}
+
+    # DINO only works with DDP
+    if training_strategy == "dino":
+        if _PL_GREATER_EQUAL_1_5_0:
+            kwargs["strategy"] = "DDP"
+        else:
+            kwargs["accelerator"] = "DDP"
+
+    trainer = flash.Trainer(
+        max_steps=3,
+        max_epochs=1,
+        gpus=torch.cuda.device_count(),
+        **kwargs,
+    )
+
     trainer.fit(embedder, datamodule=datamodule)
     predictions = trainer.predict(embedder, datamodule=datamodule)
     for prediction_batch in predictions: