【Hackathon 5th No.47】API转换 torch.histogramdd -part (#6400)

* Add docs

* Add histogramdd

* Fix

* Fix

* Fix

* Fix

docs/guides/model_convert/convert_from_pytorch/api_difference/Tensor/torch.Tensor.signbit.md

@@ -0,0 +1,15 @@
+## [无参数]torch.Tensor.signbit
+
+### [torch.Tensor.signbit](https://pytorch.org/docs/stable/generated/torch.Tensor.signbit.html#torch-signbit)
+
+```python
+torch.Tensor.signbit()
+```
+
+### [paddle.Tensor.signbit](https://github.com/PaddlePaddle/Paddle/blob/9ce3a54f456011c664c70fbcd318f2e1af0a7d81/python/paddle/tensor/math.py#L7175)
+
+```python
+paddle.Tensor.signbit()
+```
+
+两者功能一致，均无参数。

docs/guides/model_convert/convert_from_pytorch/api_difference/functional/torch.nn.functional.pdist.md

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+## [仅参数名不一致]torch.nn.functional.pdist
+
+### [torch.nn.functional.pdist](https://pytorch.org/docs/stable/generated/torch.nn.functional.pdist.html#torch.nn.functional.pdist)
+
+```python
+torch.nn.functional.pdist(input, p=2)
+```
+
+### [paddle.nn.functional.pdist](https://github.com/PaddlePaddle/Paddle/blob/210442ec30e5038809865a6105dd38308d1df2e0/python/paddle/nn/functional/distance.py#L111)
+
+```python
+paddle.nn.functional.pdist(x, p=2.0)
+```
+
+两者功能一致且参数用法一致，仅参数名不一致，具体如下：
+
+### 参数映射
+
+| PyTorch | PaddlePaddle | 备注                            |
+| ------- | ------------ | ------------------------------- |
+| input   | x            | 输入的 Tensor，仅参数名不一致。 |
+| p       | p            | 计算 p-norm 距离的 p 参数。     |

docs/guides/model_convert/convert_from_pytorch/api_difference/ops/torch.histogramdd.md

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+## [仅参数名不一致]torch.histogramdd
+
+### [torch.histogramdd](https://pytorch.org/docs/stable/generated/torch.histogramdd.html#torch-histogramdd)
+
+```python
+torch.histogramdd(input, bins, *, range=None, weight=None, density=False) -> (Tensor, Tensor[])
+```
+
+### [paddle.histogramdd](https://github.com/PaddlePaddle/Paddle/blob/a19227d9ee0e351363a4bb27b50b1becbec58a6c/python/paddle/tensor/linalg.py#L3875)
+
+```python
+paddle.histogramdd(x, bins=10, ranges=None, density=False, weights=None, name=None)
+```
+
+两者功能一致且参数用法一致，仅参数名不一致，具体如下：
+
+### 参数映射
+
+| PyTorch | PaddlePaddle | 备注                          |
+| ------- | ------------ | ----------------------------- |
+| input   | x            | 输入 Tensor，仅参数名不一致。 |
+| bins    | bins         | 直方图 bins(直条)的个数序列。 |
+| range   | ranges       | bins 的范围，仅参数名不一致。 |
+| weight  | weights      | 权重，仅参数名不一致。        |
+| density | density      | 结果中每个 bin 是否包含权重。 |

docs/guides/model_convert/convert_from_pytorch/api_difference/ops/torch.signbit.md

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+## [torch 参数更多]torch.signbit
+
+### [torch.signbit](https://pytorch.org/docs/stable/generated/torch.signbit.html#torch-signbit)
+
+```python
+torch.signbit(input, *, out=None)
+```
+
+### [paddle.signbit](https://github.com/PaddlePaddle/Paddle/blob/9ce3a54f456011c664c70fbcd318f2e1af0a7d81/python/paddle/tensor/math.py#L7175)
+
+```python
+paddle.signbit(x, name=None)
+```
+
+Pytorch 相比 Paddle 支持更多其他参数，具体如下：
+
+### 参数映射
+
+| PyTorch | PaddlePaddle | 备注                                           |
+| ------- | ------------ | ---------------------------------------------- |
+| input   | x            | 输入 Tensor，仅参数名不一致。                  |
+| out     | -            | 表示输出的 Tensor，Paddle 无此参数，需要转写。 |
+
+### 转写示例
+
+#### out：指定输出
+
+```python
+# Pytorch 写法
+torch.signbit([1., 2., 3., -1.], out=y)
+
+# Paddle 写法
+paddle.assign(paddle.signbit([1., 2., 3., -1.]), y)
+```