Port MONAI Generative utils (Project-MONAI#7134)

Towards completing Project-MONAI#6676 .

### Types of changes
<!--- Put an `x` in all the boxes that apply, and remove the not
applicable items -->
- [x] Non-breaking change (fix or new feature that would not break
existing functionality).
- [ ] Breaking change (fix or new feature that would cause existing
functionality to change).
- [ ] New tests added to cover the changes.
- [ ] Integration tests passed locally by running `./runtests.sh -f -u
--net --coverage`.
- [ ] Quick tests passed locally by running `./runtests.sh --quick
--unittests --disttests`.
- [x] In-line docstrings updated.
- [x] Documentation updated, tested `make html` command in the `docs/`
folder.

---------

Signed-off-by: Mark Graham <markgraham539@gmail.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

docs/source/utils.rst

@@ -76,3 +76,8 @@ State Cacher
 ------------
 .. automodule:: monai.utils.state_cacher
   :members:
+
+Component store
+---------------
+.. autoclass:: monai.utils.component_store.ComponentStore
+  :members:

monai/utils/__init__.py

@@ -18,6 +18,8 @@
 from .deprecate_utils import DeprecatedError, deprecated, deprecated_arg, deprecated_arg_default
 from .dist import RankFilter, evenly_divisible_all_gather, get_dist_device, string_list_all_gather
 from .enums import (
+    AdversarialIterationEvents,
+    AdversarialKeys,
     AlgoKeys,
     Average,
     BlendMode,
@@ -47,6 +49,8 @@
     MetricReduction,
     NdimageMode,
     NumpyPadMode,
+    OrderingTransformations,
+    OrderingType,
     PatchKeys,
     PostFix,
     ProbMapKeys,
@@ -95,6 +99,8 @@
     str2bool,
     str2list,
     to_tuple_of_dictionaries,
+    unsqueeze_left,
+    unsqueeze_right,
     zip_with,
 )
 from .module import (

monai/utils/enums.py

@@ -13,8 +13,11 @@
 
 import random
 from enum import Enum
+from typing import TYPE_CHECKING
 
+from monai.config import IgniteInfo
 from monai.utils import deprecated
+from monai.utils.module import min_version, optional_import
 
 __all__ = [
     "StrEnum",
@@ -88,6 +91,14 @@ def __repr__(self):
         return self.value
 
 
+if TYPE_CHECKING:
+    from ignite.engine import EventEnum
+else:
+    EventEnum, _ = optional_import(
+        "ignite.engine", IgniteInfo.OPT_IMPORT_VERSION, min_version, "EventEnum", as_type="base"
+    )
+
+
 class NumpyPadMode(StrEnum):
     """
     See also: https://numpy.org/doc/1.18/reference/generated/numpy.pad.html
@@ -692,3 +703,57 @@ class AlgoKeys(StrEnum):
     ALGO = "algo_instance"
     IS_TRAINED = "is_trained"
     SCORE = "best_metric"
+
+
+class AdversarialKeys(StrEnum):
+    """
+    Keys used by the AdversarialTrainer.
+    `REALS` are real images from the batch.
+    `FAKES` are fake images generated by the generator. Are the same as PRED.
+    `REAL_LOGITS` are logits of the discriminator for the real images.
+    `FAKE_LOGIT` are logits of the discriminator for the fake images.
+    `RECONSTRUCTION_LOSS` is the loss value computed by the reconstruction loss function.
+    `GENERATOR_LOSS` is the loss value computed by the generator loss function. It is the
+                discriminator loss for the fake images. That is backpropagated through the generator only.
+    `DISCRIMINATOR_LOSS` is the loss value computed by the discriminator loss function. It is the
+                discriminator loss for the real images and the fake images. That is backpropagated through the
+                discriminator only.
+    """
+
+    REALS = "reals"
+    REAL_LOGITS = "real_logits"
+    FAKES = "fakes"
+    FAKE_LOGITS = "fake_logits"
+    RECONSTRUCTION_LOSS = "reconstruction_loss"
+    GENERATOR_LOSS = "generator_loss"
+    DISCRIMINATOR_LOSS = "discriminator_loss"
+
+
+class AdversarialIterationEvents(EventEnum):
+    """
+    Keys used to define events as used in the AdversarialTrainer.
+    """
+
+    RECONSTRUCTION_LOSS_COMPLETED = "reconstruction_loss_completed"
+    GENERATOR_FORWARD_COMPLETED = "generator_forward_completed"
+    GENERATOR_DISCRIMINATOR_FORWARD_COMPLETED = "generator_discriminator_forward_completed"
+    GENERATOR_LOSS_COMPLETED = "generator_loss_completed"
+    GENERATOR_BACKWARD_COMPLETED = "generator_backward_completed"
+    GENERATOR_MODEL_COMPLETED = "generator_model_completed"
+    DISCRIMINATOR_REALS_FORWARD_COMPLETED = "discriminator_reals_forward_completed"
+    DISCRIMINATOR_FAKES_FORWARD_COMPLETED = "discriminator_fakes_forward_completed"
+    DISCRIMINATOR_LOSS_COMPLETED = "discriminator_loss_completed"
+    DISCRIMINATOR_BACKWARD_COMPLETED = "discriminator_backward_completed"
+    DISCRIMINATOR_MODEL_COMPLETED = "discriminator_model_completed"
+
+
+class OrderingType(StrEnum):
+    RASTER_SCAN = "raster_scan"
+    S_CURVE = "s_curve"
+    RANDOM = "random"
+
+
+class OrderingTransformations(StrEnum):
+    ROTATE_90 = "rotate_90"
+    TRANSPOSE = "transpose"
+    REFLECT = "reflect"

monai/utils/misc.py

@@ -888,3 +888,13 @@ def is_sqrt(num: Sequence[int] | int) -> bool:
     sqrt_num = [int(math.sqrt(_num)) for _num in num]
     ret = [_i * _j for _i, _j in zip(sqrt_num, sqrt_num)]
     return ensure_tuple(ret) == num
+
+
+def unsqueeze_right(arr: NdarrayOrTensor, ndim: int) -> NdarrayOrTensor:
+    """Append 1-sized dimensions to `arr` to create a result with `ndim` dimensions."""
+    return arr[(...,) + (None,) * (ndim - arr.ndim)]
+
+
+def unsqueeze_left(arr: NdarrayOrTensor, ndim: int) -> NdarrayOrTensor:
+    """Prepend 1-sized dimensions to `arr` to create a result with `ndim` dimensions."""
+    return arr[(None,) * (ndim - arr.ndim)]

tests/test_squeeze_unsqueeze.py

@@ -0,0 +1,71 @@
+# Copyright (c) MONAI Consortium
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#     http://www.apache.org/licenses/LICENSE-2.0
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from __future__ import annotations
+
+import unittest
+
+import numpy as np
+import torch
+from parameterized import parameterized
+
+from monai.utils import unsqueeze_left, unsqueeze_right
+
+RIGHT_CASES = [
+    (np.random.rand(3, 4).astype(np.float32), 5, (3, 4, 1, 1, 1)),
+    (torch.rand(3, 4).type(torch.float32), 5, (3, 4, 1, 1, 1)),
+    (np.random.rand(3, 4).astype(np.float64), 5, (3, 4, 1, 1, 1)),
+    (torch.rand(3, 4).type(torch.float64), 5, (3, 4, 1, 1, 1)),
+    (np.random.rand(3, 4).astype(np.int32), 5, (3, 4, 1, 1, 1)),
+    (torch.rand(3, 4).type(torch.int32), 5, (3, 4, 1, 1, 1)),
+]
+
+
+LEFT_CASES = [
+    (np.random.rand(3, 4).astype(np.float32), 5, (1, 1, 1, 3, 4)),
+    (torch.rand(3, 4).type(torch.float32), 5, (1, 1, 1, 3, 4)),
+    (np.random.rand(3, 4).astype(np.float64), 5, (1, 1, 1, 3, 4)),
+    (torch.rand(3, 4).type(torch.float64), 5, (1, 1, 1, 3, 4)),
+    (np.random.rand(3, 4).astype(np.int32), 5, (1, 1, 1, 3, 4)),
+    (torch.rand(3, 4).type(torch.int32), 5, (1, 1, 1, 3, 4)),
+]
+ALL_CASES = [
+    (np.random.rand(3, 4), 2, (3, 4)),
+    (np.random.rand(3, 4), 0, (3, 4)),
+    (np.random.rand(3, 4), -1, (3, 4)),
+    (np.array(3), 4, (1, 1, 1, 1)),
+    (np.array(3), 0, ()),
+    (np.random.rand(3, 4).astype(np.int32), 2, (3, 4)),
+    (np.random.rand(3, 4).astype(np.int32), 0, (3, 4)),
+    (np.random.rand(3, 4).astype(np.int32), -1, (3, 4)),
+    (np.array(3).astype(np.int32), 4, (1, 1, 1, 1)),
+    (np.array(3).astype(np.int32), 0, ()),
+    (torch.rand(3, 4), 2, (3, 4)),
+    (torch.rand(3, 4), 0, (3, 4)),
+    (torch.rand(3, 4), -1, (3, 4)),
+    (torch.tensor(3), 4, (1, 1, 1, 1)),
+    (torch.tensor(3), 0, ()),
+    (torch.rand(3, 4).type(torch.int32), 2, (3, 4)),
+    (torch.rand(3, 4).type(torch.int32), 0, (3, 4)),
+    (torch.rand(3, 4).type(torch.int32), -1, (3, 4)),
+    (torch.tensor(3).type(torch.int32), 4, (1, 1, 1, 1)),
+    (torch.tensor(3).type(torch.int32), 0, ()),
+]
+
+
+class TestUnsqueeze(unittest.TestCase):
+    @parameterized.expand(RIGHT_CASES + ALL_CASES)
+    def test_unsqueeze_right(self, arr, ndim, shape):
+        self.assertEqual(unsqueeze_right(arr, ndim).shape, shape)
+
+    @parameterized.expand(LEFT_CASES + ALL_CASES)
+    def test_unsqueeze_left(self, arr, ndim, shape):
+        self.assertEqual(unsqueeze_left(arr, ndim).shape, shape)