[note]-MSELoss- API英文文档中包含报错信息的问题修复 (#49577)

python/paddle/nn/layer/loss.py

@@ -525,16 +525,24 @@ class MSELoss(Layer):
     r"""
     **Mean Square Error Loss**
     Computes the mean square error (squared L2 norm) of given input and label.
+
     If :attr:`reduction` is set to ``'none'``, loss is calculated as:
+
     .. math::
         Out = (input - label)^2
+
     If :attr:`reduction` is set to ``'mean'``, loss is calculated as:
+
     .. math::
         Out = \operatorname{mean}((input - label)^2)
+
     If :attr:`reduction` is set to ``'sum'``, loss is calculated as:
+
     .. math::
         Out = \operatorname{sum}((input - label)^2)
+
     where `input` and `label` are `float32` tensors of same shape.
+
     Parameters:
         reduction (str, optional): The reduction method for the output,
             could be 'none' | 'mean' | 'sum'.
@@ -542,12 +550,16 @@ class MSELoss(Layer):
             If :attr:`size_average` is ``'sum'``, the reduced sum loss is returned.
             If :attr:`reduction` is ``'none'``, the unreduced loss is returned.
             Default is ``'mean'``.
+
     Shape:
         input (Tensor): Input tensor, the data type is float32 or float64
         label (Tensor): Label tensor, the data type is float32 or float64
         output (Tensor): output tensor storing the MSE loss of input and label, the data type is same as input.
+
     Examples:
+
         .. code-block:: python
+
             import paddle
             mse_loss = paddle.nn.loss.MSELoss()
             input = paddle.to_tensor([1.5])
@@ -555,6 +567,7 @@ class MSELoss(Layer):
             output = mse_loss(input, label)
             print(output)
             # [0.04000002]
+
     """
 
     def __init__(self, reduction='mean'):