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Hackathon No.30 #4644

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2 changes: 2 additions & 0 deletions docs/api/paddle/nn/Overview_cn.rst
Original file line number Diff line number Diff line change
Expand Up @@ -256,6 +256,7 @@ Loss层
" :ref:`paddle.nn.MSELoss <cn_api_paddle_nn_MSELoss>` ", "均方差误差损失层"
" :ref:`paddle.nn.NLLLoss <cn_api_nn_loss_NLLLoss>` ", "NLLLoss层"
" :ref:`paddle.nn.SmoothL1Loss <cn_api_paddle_nn_SmoothL1Loss>` ", "平滑L1损失层"
" :ref:`paddle.nn.TripletMarginWithDistanceLoss <cn_api_paddle_nn_TripletMarginWithDistanceLoss>` ", "TripletMarginWithDistanceLoss层"

.. _vision_layers:

Expand Down Expand Up @@ -475,6 +476,7 @@ Embedding相关函数
" :ref:`paddle.nn.functional.smooth_l1_loss <cn_paddle_nn_functional_loss_smooth_l1>` ", "用于计算平滑L1损失"
" :ref:`paddle.nn.functional.softmax_with_cross_entropy <cn_api_fluid_layers_softmax_with_cross_entropy>` ", "将softmax操作、交叉熵损失函数的计算过程进行合并"
" :ref:`paddle.nn.functional.margin_cross_entropy <cn_api_paddle_nn_functional_margin_cross_entropy>` ", "支持 ``Arcface``,``Cosface``,``Sphereface`` 的结合 Margin 损失函数"
" :ref:`paddle.nn.functional.triplet_margin_with_distance_loss <cn_paddle_nn_functional_triplet_margin_with_distance_loss>` ", "用户自定义距离函数用于计算triplet margin loss 损失"
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这里是不是缺少了nn.functional.triplet_margin_with_distance_loss的API文档?

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已添加

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已添加


.. _common_functional:

Expand Down
50 changes: 50 additions & 0 deletions docs/api/paddle/nn/TripletMarginWithDistanceLoss_cn.rst
Original file line number Diff line number Diff line change
@@ -0,0 +1,50 @@
.. _cn_api_paddle_nn_TripletMarginWithDistanceLoss:

TripletMarginWithDistanceLoss
-------------------------------

.. py:class:: paddle.nn.TripletMarginWithDistanceLoss(distance_function=None, margin: float = 1.0, swap: bool = False, reduction: str = 'mean', name:str=None)

创建一个TripletMarginWithDistanceLoss的可调用类,通过计算输入 `input` 和 `positive` 和 `negative` 间的 `triplet margin loss` 损失,测量样本之间,即 `input` 与 `positive examples` 和 `negative examples` 的相对相似性。


损失函数按照下列公式计算

.. math::
L(input, pos, neg) = \max \{d(input_i, pos_i) - d(input_i, neg_i) + {\rm margin}, 0\}


其中的距离函数可以由用户自定义,使用 lambda 或是 def 都可以。如果未定义则调用2范数计算距离

.. math::
d(x_i, y_i) = \left\lVert {\bf x}_i - {\bf y}_i \right\rVert_2


其中 ``distance_function`` 为距离函数,默认为2范数。 ``margin`` 为(input,positive)与(input,negative)的距离间隔, ``swap`` 为True时,会比较(input,negative)和(positive,negative)的大小,并将(input,negative)换为其中较小的值,内容详见论文 `Learning shallow convolutional feature descriptors with triplet losses <http://www.bmva.org/bmvc/2016/papers/paper119/paper119.pdf>`_。

最后,该api会添加 `reduce` 操作到前面的输出Out上。当 `reduction` 为 `none` 时,直接返回最原始的 `Out` 结果。当 `reduction` 为 `mean` 时,
返回输出的均值 :math:`Out = MEAN(Out)` 。当 `reduction` 为 `sum` 时,返回输出的求和 :math:`Out = SUM(Out)` 。


参数
:::::::::
- **distance_function** (可选) - 手动指定范数,默认为None, 使用欧式距离。
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  • 参数的数据类型需要增加
  • , -->

- **margin** (float,可选) - 手动指定间距,默认为1。
- **swap** (bool,可选) - 默认为False。
- **reduction** (str,可选) - 指定应用于输出结果的计算方式,可选值有: ``'none'``, ``'mean'``, ``'sum'`` 。默认为 ``'mean'``,计算 Loss 的均值;设置为 ``'sum'`` 时,计算 Loss 的总和;设置为 ``'none'`` 时,则返回原始 Loss。
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, -->

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已修改

- **name** (str,可选) - 操作的名称(可选,默认值为None)。更多信息请参见 :ref:`api_guide_Name` 。
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image

- 同TripletMarginLoss,需要注意中英文标点符号问题 - reduction显示不正常

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done

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done

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  • 参数需在括号里写清数据类型和是否可选,可选参数需要注明默认值
  • , --> ,句尾加
  • 参数要和源码顺序保持一致
  • 没有name参数就不要写
  • 中英文字符之间最好使用一个空格隔开

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已修改


形状
:::::::::
- **input** (Tensor) - :math:`[N, *]` , 其中N是batch_size, `*` 是任意其他维度。数据类型是float32、float64。
- **positive** (Tensor) - :math:`[N, *]` ,标签 ``positive`` 的维度、数据类型与输入 ``input`` 相同。
- **negative** (Tensor) - :math:`[N, *]` ,标签 ``negative`` 的维度、数据类型与输入 ``input`` 相同。
- **output** (Tensor) - 输出的Tensor。如果 :attr:`reduction` 是 ``'none'``, 则输出的维度为 :math:`[N, *]` , 与输入 ``input`` 的形状相同。如果 :attr:`reduction` 是 ``'mean'`` 或 ``'sum'``, 则输出的维度为 :math:`[1]` 。

返回
:::::::::
返回计算 TripletMarginWithDistanceLoss 的可调用对象。

代码示例
:::::::::
COPY-FROM: paddle.nn.TripletMarginWithDistanceLoss
Original file line number Diff line number Diff line change
@@ -0,0 +1,52 @@
.. _cn_api_paddle_nn_functional_triplet_margin_with_distance_loss:

triplet_margin_with_distance_loss
-------------------------------

.. py:class:: paddle.nn.functional.triplet_margin_with_distance_loss(input, positive, negative, distance_function=None, swap: bool = False, margin: float = 1.0, reduction: str = 'mean', name:str=None)

计算输入 `input` 和 `positive` 和 `negative` 间的 `triplet margin loss` 损失。


损失函数按照下列公式计算

.. math::
L(input, pos, neg) = \max \{d(input_i, pos_i) - d(input_i, neg_i) + {\rm margin}, 0\}


其中的距离函数可以由用户自定义,使用 lambda 或是 def 都可以。如果未定义则调用2范数计算距离

.. math::
d(x_i, y_i) = \left\lVert {\bf x}_i - {\bf y}_i \right\rVert_2


然后, ``distance_function`` 为距离函数,默认为2范数。 ``margin`` 为(input,positive)与(input,negative)的距离间隔, ``swap`` 为True时,会比较(input,negative)和(positive,negative)的大小,并将(input,negative)换为其中较小的值,内容详见论文 `Learning shallow convolutional feature descriptors with triplet losses <http://www.bmva.org/bmvc/2016/papers/paper119/paper119.pdf>`_。

最后,该算子会添加 `reduce` 操作到前面的输出Out上。当 `reduction` 为 `none` 时,直接返回最原始的 `Out` 结果。当 `reduction` 为 `mean` 时,返回输出的均值 :math:`Out = MEAN(Out)` 。当 `reduction` 为 `sum` 时,返回输出的求和 :math:`Out = SUM(Out)` 。


参数
:::::::::
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参考TripletMarginWithDistanceLoss进行修改

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已修改

- **input** (Tensor) - :math:`[N, * ]` , 其中N是batch_size, `*` 是任意其他维度。数据类型是float32、float64。
- **positive** (Tensor) - :math:`[N, *]` ,正样本,维度、数据类型与输入 ``input`` 相同。
- **negative** (Tensor) - :math:`[N, *]` ,负样本,维度、数据类型与输入 ``input`` 相同。
- **distance_function** (Callable,可选) - 手动指定范数,默认为 None, 计算欧式距离。
- **swap** (bool,可选) - 默认为 False。
- **margin** (float,可选) - 手动指定间距,默认为1。
- **reduction** (str,可选) - 指定应用于输出结果的计算方式,可选值有: ``'none'``, ``'mean'``, ``'sum'`` 。默认为 ``'mean'``,计算 Loss 的均值;设置为 ``'sum'`` 时,计算 Loss 的总和;设置为 ``'none'`` 时,则返回原始 Loss。
- **name** (str,可选) - 操作的名称(可选,默认值为None)。更多信息请参见 :ref:`api_guide_Name` 。

形状
:::::::::
- **input** (Tensor) - :math:`[N, *]` , 其中N是batch_size, `*` 是任意其他维度。数据类型是float32、float64。
- **positive** (Tensor) - :math:`[N, *]` ,标签 ``positive`` 的维度、数据类型与输入 ``input`` 相同。
- **negative** (Tensor) - :math:`[N, *]` ,标签 ``negative`` 的维度、数据类型与输入 ``input`` 相同。
- **output** (Tensor) - 输出的Tensor。如果 :attr:`reduction` 是 ``'none'``, 则输出的维度为 :math:`[N, *]` , 与输入 ``input`` 的形状相同。如果 :attr:`reduction` 是 ``'mean'`` 或 ``'sum'``, 则输出的维度为 :math:`[1]` 。

返回
:::::::::
输出的Tensor。如果 :attr:`reduction` 是 ``'none'``, 则输出的维度为 :math:`[N, *]` , 与输入 ``input`` 的形状相同。如果 :attr:`reduction` 是 ``'mean'`` 或 ``'sum'``, 则输出的维度为 :math:`[1]` 。

代码示例
:::::::::
COPY-FROM: paddle.nn.functional.triplet_margin_with_distance_loss