add Overview for distribution and amp

doc/paddle/api/paddle/amp/Overview_cn.rst

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+.. _cn_overview_amp:
+
+paddle.amp
+---------------------
+
+paddle.amp 目录下包含飞桨框架支持的动态图自动混合精度(AMP)相关的API。具体如下：
+
+-  :ref:`AMP相关API <about_amp>`
+-  :ref:`开启AMP后默认转化为float16计算的相关OP <about_amp_white_list_ops>`
+-  :ref:`开启AMP后默认使用float32计算的相关OP <about_amp_black_list_ops>`
+
+
+
+.. _about_amp:
+AMP相关API
+::::::::::::::::::::
+
+.. csv-table::
+    :header: "API名称", "API功能"
+    :widths: 10, 30
+
+    " :ref:`auto_cast <cn_api_amp_auto_cast>` ", "创建AMP上下文环境"
+    " :ref:`GradScaler <cn_api_amp_GradScaler>` ", "控制loss的缩放比例"
+
+.. _about_amp_white_list_ops:
+开启AMP后默认转化为float16计算的相关OP
+:::::::::::::::::::::::
+
+.. csv-table::
+    :header: "OP名称", "OP功能"
+    :widths: 10, 30
+
+    "conv2d", "卷积计算"
+    "matmul", "矩阵乘法"
+    "matmul_v2", "矩阵乘法"
+    "mul", "矩阵乘法"
+
+.. _about_amp_black_list_ops:
+开启AMP后默认使用float32计算的相关OP
+:::::::::::::::::::::::
+
+.. csv-table::
+    :header: "OP名称", "OP功能"
+    :widths: 10, 30
+
+    "exp", "指数运算"
+    "square", "平方运算"
+    "log", "对数运算"
+    "mean", "取平均值"
+    "sum", "求和运算"
+    "cos_sim", "余弦相似度"
+    "softmax", "softmax操作"
+    "softmax_with_cross_entropy", "softmax交叉熵损失函数"
+    "sigmoid_cross_entropy_with_logits", "按元素的概率误差"
+    "cross_entropy", "交叉熵"
+    "cross_entropy2", "交叉熵"
+
+

doc/paddle/api/paddle/distribution/Overview_cn.rst

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+.. _cn_overview_distribution:
+
+paddle.distribution
+---------------------
+
+paddle.distribution 目录下包含飞桨框架支持的概率分布相关的API。具体如下：
+
+-  :ref:`概率分布相关API <about_distribution>`
+
+
+
+.. _about_distribution:
+概率分布相关API
+::::::::::::::::::::
+
+.. csv-table::
+    :header: "API名称", "API功能"
+    :widths: 10, 30
+
+    " :ref:`Distribution <cn_api_distribution_Distribution>` ", "Distribution概率分布抽象基类"
+    " :ref:`Categorical <cn_api_distribution_Categorical>` ", "Categorical概率分布类"
+    " :ref:`Normal <cn_api_distribution_Normal>` ", "Normal概率分布类"
+    " :ref:`Uniform <cn_api_distribution_Uniform>` ", "Uniform概率分布类"
+