【Hackathon No.21】为 Paddle 新增 SoftMarginLoss

python/paddle/fluid/tests/unittests/test_soft_margin_loss.py

@@ -0,0 +1,177 @@
+# Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
+#
+# 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.
+
+import paddle
+import numpy as np
+import unittest
+
+
+def test_static_layer(
+    place,
+    input_np,
+    label_np,
+    reduction='mean',
+):
+    paddle.enable_static()
+    prog = paddle.static.Program()
+    startup_prog = paddle.static.Program()
+    with paddle.static.program_guard(prog, startup_prog):
+        input = paddle.static.data(name='input',
+                                   shape=input_np.shape,
+                                   dtype=input_np.dtype)
+        label = paddle.static.data(name='label',
+                                   shape=label_np.shape,
+                                   dtype=label_np.dtype)
+        sm_loss = paddle.nn.loss.SoftMarginLoss(reduction=reduction)
+        res = sm_loss(input, label)
+        exe = paddle.static.Executor(place)
+        static_result = exe.run(prog,
+                                feed={
+                                    "input": input_np,
+                                    "label": label_np
+                                },
+                                fetch_list=[res])
+    return static_result
+
+
+def test_static_functional(
+    place,
+    input_np,
+    label_np,
+    reduction='mean',
+):
+    paddle.enable_static()
+    prog = paddle.static.Program()
+    startup_prog = paddle.static.Program()
+    with paddle.static.program_guard(prog, startup_prog):
+        input = paddle.static.data(name='input',
+                                   shape=input_np.shape,
+                                   dtype=input_np.dtype)
+        label = paddle.static.data(name='label',
+                                   shape=label_np.shape,
+                                   dtype=label_np.dtype)
+
+        res = paddle.nn.functional.soft_margin_loss(input,
+                                                    label,
+                                                    reduction=reduction)
+        exe = paddle.static.Executor(place)
+        static_result = exe.run(prog,
+                                feed={
+                                    "input": input_np,
+                                    "label": label_np
+                                },
+                                fetch_list=[res])
+    return static_result
+
+
+def test_dygraph_layer(
+    place,
+    input_np,
+    label_np,
+    reduction='mean',
+):
+    paddle.disable_static()
+    sm_loss = paddle.nn.loss.SoftMarginLoss(reduction=reduction)
+    dy_res = sm_loss(paddle.to_tensor(input_np), paddle.to_tensor(label_np))
+    dy_result = dy_res.numpy()
+    paddle.enable_static()
+    return dy_result
+
+
+def test_dygraph_functional(
+    place,
+    input_np,
+    label_np,
+    reduction='mean',
+):
+    paddle.disable_static()
+    input = paddle.to_tensor(input_np)
+    label = paddle.to_tensor(label_np)
+
+    dy_res = paddle.nn.functional.soft_margin_loss(input,
+                                                   label,
+                                                   reduction=reduction)
+    dy_result = dy_res.numpy()
+    paddle.enable_static()
+    return dy_result
+
+
+def calc_softmarginloss(
+    input_np,
+    label_np,
+    reduction='mean',
+):
+    expected = np.log(1 + np.exp(-label_np * input_np))
+    # expected = np.mean(expected, axis=-1)
+
+    if reduction == 'mean':
+        expected = np.mean(expected)
+    elif reduction == 'sum':
+        expected = np.sum(expected)
+    else:
+        expected = expected
+
+    return expected
+
+
+class TestSoftMarginLoss(unittest.TestCase):
+
+    def test_SoftMarginLoss(self):
+        input_np = np.random.uniform(0.1, 0.8, size=(5, 5)).astype(np.float64)
+        types = [np.int32, np.int64, np.float32, np.float64]
+        places = ['cpu']
+        if paddle.device.is_compiled_with_cuda():
+            places.append('gpu')
+        reductions = ['sum', 'mean', 'none']
+        for place in places:
+            for reduction in reductions:
+                for _type in types:
+                    label_np = np.random.randint(0, 2,
+                                                 size=(5, 5)).astype(_type)
+                    label_np[label_np == 0] = -1
+                    static_result = test_static_layer(place, input_np, label_np,
+                                                      reduction)
+                    dy_result = test_dygraph_layer(place, input_np, label_np,
+                                                   reduction)
+                    expected = calc_softmarginloss(input_np, label_np,
+                                                   reduction)
+                    self.assertTrue(np.allclose(static_result, expected))
+                    self.assertTrue(np.allclose(static_result, dy_result))
+                    self.assertTrue(np.allclose(dy_result, expected))
+                    static_functional = test_static_functional(
+                        place, input_np, label_np, reduction)
+                    dy_functional = test_dygraph_functional(
+                        place, input_np, label_np, reduction)
+                    self.assertTrue(np.allclose(static_functional, expected))
+                    self.assertTrue(
+                        np.allclose(static_functional, dy_functional))
+                    self.assertTrue(np.allclose(dy_functional, expected))
+
+    def test_SoftMarginLoss_error(self):
+        paddle.disable_static()
+        self.assertRaises(ValueError,
+                          paddle.nn.loss.SoftMarginLoss,
+                          reduction="unsupport reduction")
+        input = paddle.to_tensor([[0.1, 0.3]], dtype='float32')
+        label = paddle.to_tensor([[-1.0, 1.0]], dtype='float32')
+        self.assertRaises(ValueError,
+                          paddle.nn.functional.soft_margin_loss,
+                          input=input,
+                          label=label,
+                          reduction="unsupport reduction")
+        paddle.enable_static()
+
+
+if __name__ == "__main__":
+    unittest.main()

python/paddle/nn/__init__.py

@@ -111,6 +111,7 @@
 from .layer.loss import CosineEmbeddingLoss  # noqa: F401
 from .layer.loss import TripletMarginWithDistanceLoss
 from .layer.loss import TripletMarginLoss
+from .layer.loss import SoftMarginLoss
 from .layer.norm import BatchNorm  # noqa: F401
 from .layer.norm import SyncBatchNorm  # noqa: F401
 from .layer.norm import GroupNorm  # noqa: F401
@@ -320,4 +321,5 @@ def weight_norm(*args):
     'RReLU',
     'TripletMarginWithDistanceLoss',
     'TripletMarginLoss',
+    'SoftMarginLoss',
 ]

python/paddle/nn/functional/__init__.py

@@ -94,6 +94,7 @@
 from .loss import multi_label_soft_margin_loss
 from .loss import triplet_margin_with_distance_loss
 from .loss import triplet_margin_loss
+from .loss import soft_margin_loss
 from .norm import batch_norm  # noqa: F401
 from .norm import instance_norm  # noqa: F401
 from .norm import layer_norm  # noqa: F401
@@ -238,4 +239,5 @@
     'rrelu',
     'triplet_margin_with_distance_loss',
     'triplet_margin_loss',
+    'soft_margin_loss',
 ]

python/paddle/nn/functional/loss.py

@@ -3200,3 +3200,82 @@ def triplet_margin_loss(input,
         return paddle.sum(loss, name=name)
     elif reduction == 'none':
         return loss
+
+
+def soft_margin_loss(input, label, reduction='mean', name=None):
+    """
+    The API measures the soft margin loss between input predictions ``input``
+    and target labels ``label`` . It can be described as:
+
+    .. math::
+        Out = log(1 + exp((-label * input)))
+
+    Parameters:
+
+        input (Tensor): The input predications tensor with shape: [N, *],
+            N is batch_size, `*` means any number of additional dimensions. The ``input`` ranges from -inf to inf.
+             Available dtype is float32, float64.
+
+        label (Tensor): The target labels tensor with the same shape as
+            ``input``. The target labels which values should be numbers -1 or 1.
+            Available dtype is int32, int64, float32, float64.
+
+        reduction (str, optional): Indicate how to average the loss by batch_size,
+            the candidates are ``'none'`` | ``'mean'`` | ``'sum'``.
+            If :attr:`reduction` is ``'none'``, the unreduced loss is returned;
+            If :attr:`reduction` is ``'mean'``, the reduced mean loss is returned;
+            If :attr:`reduction` is ``'sum'``, the summed loss is returned.
+            Default is ``'mean'``.
+
+        name (str, optional): Name for the operation (optional, default is None).
+            For more information, please refer to :ref:`api_guide_Name`.
+
+    Returns:
+
+        Output (Tensor): If ``reduction`` is ``'none'``, the shape of output is
+            same as ``input`` , else the shape of output is [1].
+
+    Examples:
+        .. code-block:: python
+
+            import paddle
+            import numpy as np
+
+            input = paddle.to_tensor([[0.5, 0.6, 0.7],[0.3, 0.5, 0.2]], 'float32')
+            label = paddle.to_tensor([[1.0, -1.0, 1.0],[-1.0, 1.0, 1.0]], 'float32')
+            output = paddle.nn.functional.soft_margin_loss(input, label)
+
+            input_np = np.random.uniform(0.1, 0.8, size=(5, 5)).astype(np.float64)
+            label_np = np.random.randint(0, 2, size=(5, 5)).astype(np.int64)
+            label_np[label_np==0]=-1
+            input = paddle.to_tensor(input_np)
+            label = paddle.to_tensor(label_np)
+            output = paddle.nn.functional.soft_margin_loss(input, label, reduction='none')
+    """
+    if reduction not in ['sum', 'mean', 'none']:
+        raise ValueError(
+            "The value of 'reduction' in soft_margin_loss should be 'sum', "
+            "'mean' or 'none', but received %s, which is not allowed." %
+            reduction)
+
+    if not _non_static_mode():
+        fluid.data_feeder.check_variable_and_dtype(input, 'input',
+                                                   ['float32', 'float64'],
+                                                   'soft_margin_loss')
+        fluid.data_feeder.check_variable_and_dtype(
+            label, 'label', ['int32', 'int64', 'float32', 'float64'],
+            'soft_margin_loss')
+
+    if not (input.shape == label.shape):
+        raise ValueError("input's shape must equal to "
+                         "label's shape")
+
+    label = fluid.layers.cast(label, input.dtype)
+    out = paddle.log(1 + paddle.exp(-label * input))
+
+    if reduction == 'sum':
+        return paddle.sum(out, name=name)
+    elif reduction == 'mean':
+        return paddle.mean(out, name=name)
+    else:
+        return out

python/paddle/nn/layer/__init__.py

@@ -82,6 +82,7 @@
 from .loss import HingeEmbeddingLoss  # noqa: F401
 from .loss import TripletMarginWithDistanceLoss
 from .loss import TripletMarginLoss
+from .loss import SoftMarginLoss
 from .norm import BatchNorm1D  # noqa: F401
 from .norm import BatchNorm2D  # noqa: F401
 from .norm import BatchNorm3D  # noqa: F401

python/paddle/nn/layer/loss.py

@@ -1691,3 +1691,74 @@ def forward(self, input, positive, negative):
                                      swap=self.swap,
                                      reduction=self.reduction,
                                      name=self.name)
+
+
+class SoftMarginLoss(Layer):
+    r"""
+    Creates a criterion that measures a two-class soft margin loss between input predictions ``input``
+    and target labels ``label`` . It can be described as:
+
+    .. math::
+        Out = log(1 + exp((-label * input)))
+
+    Parameters:
+
+        reduction (str, optional): Indicate how to average the loss by batch_size,
+            the candidates are ``'none'`` | ``'mean'`` | ``'sum'``.
+            If :attr:`reduction` is ``'none'``, the unreduced loss is returned;
+            If :attr:`reduction` is ``'mean'``, the reduced mean loss is returned;
+            If :attr:`reduction` is ``'sum'``, the summed loss is returned.
+            Default is ``'mean'``.
+
+        name (str, optional): Name for the operation (optional, default is None). For more information, please refer to :ref:`api_guide_Name`.
+
+    Shapes:
+
+        Input (Tensor): The input tensor with shape: [N, *],
+        N is batch_size, `*` means any number of additional dimensions. The ``input`` ranges from -inf to inf
+        Available dtype is float32, float64.
+
+        Label (Tensor): The target labels tensor with the same shape as
+        ``input``. The target labels which values should be numbers -1 or 1.
+        Available dtype is int32, int64, float32, float64.
+
+        Output (Tensor): If ``reduction`` is ``'none'``, the shape of output is
+            same as ``input`` , else the shape of output is [1].
+
+    Returns:
+        A callable object of SoftMarginLoss.
+
+    Examples:
+        .. code-block:: python
+
+            import paddle
+            import numpy as np
+
+            input = paddle.to_tensor([[0.5, 0.6, 0.7],[0.3, 0.5, 0.2]], 'float32')
+            label = paddle.to_tensor([[1.0, -1.0, 1.0],[-1.0, 1.0, 1.0]], 'float32')
+            soft_margin_loss = paddle.nn.SoftMarginLoss()
+            output = soft_margin_loss(input, label)
+
+            input_np = np.random.uniform(0.1, 0.8, size=(5, 5)).astype(np.float64)
+            label_np = np.random.randint(0, 2, size=(5, 5)).astype(np.int64)
+            label_np[label_np==0]=-1
+            input = paddle.to_tensor(input_np)
+            label = paddle.to_tensor(label_np)
+            soft_margin_loss = paddle.nn.SoftMarginLoss(reduction='none')
+            output = soft_margin_loss(input, label)
+    """
+
+    def __init__(self, reduction='mean', name=None):
+        if reduction not in ['sum', 'mean', 'none']:
+            raise ValueError(
+                "The value of 'reduction' in SoftMarginLoss should be 'sum', 'mean' or 'none', but "
+                "received %s, which is not allowed." % reduction)
+
+        super(SoftMarginLoss, self).__init__()
+        self.reduction = reduction
+        self.name = name
+
+    def forward(self, input, label):
+        out = paddle.nn.functional.soft_margin_loss(input, label,
+                                                    self.reduction, self.name)
+        return out