fix cvm and DataFeedDesc apis (#19994)

* fix cvm and DataFeedDesc apis test=develop test=document_preview test=document_fix

* add ref and rst tensor type test=develop test=document_preview test=document_fix

* change API.spec test=develop test=ducument_fix

* fix fluid.data test=develop test=document_preview test=document_fix

* change API.spec test=develop test=document_preview test=document_fix

* fix cvm example test=develop test=document_preview test=document_fix

* change API.spec test=develop test=document_preview test=document_fix

* fix cvm example test=develop test=document_fix

* fix cvm example test=develop test=document_fix

* change api.spec example test=develop test=document_fix

paddle/fluid/API.spec

@@ -55,8 +55,8 @@ paddle.fluid.create_random_int_lodtensor (ArgSpec(args=['recursive_seq_lens', 'b
 paddle.fluid.DataFeedDesc ('paddle.fluid.data_feed_desc.DataFeedDesc', ('document', '43877a0d9357db94d3dbc7359cbe8c73'))
 paddle.fluid.DataFeedDesc.__init__ (ArgSpec(args=['self', 'proto_file'], varargs=None, keywords=None, defaults=None), ('document', '6adf97f83acf6453d4a6a4b1070f3754'))
 paddle.fluid.DataFeedDesc.desc (ArgSpec(args=['self'], varargs=None, keywords=None, defaults=None), ('document', '9c6615854b61caa5f0d3e6ccc5e51338'))
-paddle.fluid.DataFeedDesc.set_batch_size (ArgSpec(args=['self', 'batch_size'], varargs=None, keywords=None, defaults=None), ('document', 'a34790bff4a2891713ddd644db56418d'))
-paddle.fluid.DataFeedDesc.set_dense_slots (ArgSpec(args=['self', 'dense_slots_name'], varargs=None, keywords=None, defaults=None), ('document', 'fdd07ce63e72bed57f2c0db5bec5720f'))
+paddle.fluid.DataFeedDesc.set_batch_size (ArgSpec(args=['self', 'batch_size'], varargs=None, keywords=None, defaults=None), ('document', '4e4652f098a9c7bb0a10cf623108015b'))
+paddle.fluid.DataFeedDesc.set_dense_slots (ArgSpec(args=['self', 'dense_slots_name'], varargs=None, keywords=None, defaults=None), ('document', '0b7a04bf99ed8983ad7ad4fda19be061'))
 paddle.fluid.DataFeedDesc.set_use_slots (ArgSpec(args=['self', 'use_slots_name'], varargs=None, keywords=None, defaults=None), ('document', 'c23a79dfa04edd014b477bd4b183da06'))
 paddle.fluid.CompiledProgram ('paddle.fluid.compiler.CompiledProgram', ('document', '598d294107d44d7620bce76527a92c37'))
 paddle.fluid.CompiledProgram.__init__ (ArgSpec(args=['self', 'program_or_graph', 'build_strategy'], varargs=None, keywords=None, defaults=(None,)), ('document', '6adf97f83acf6453d4a6a4b1070f3754'))
@@ -300,7 +300,7 @@ paddle.fluid.layers.kldiv_loss (ArgSpec(args=['x', 'target', 'reduction', 'name'
 paddle.fluid.layers.npair_loss (ArgSpec(args=['anchor', 'positive', 'labels', 'l2_reg'], varargs=None, keywords=None, defaults=(0.002,)), ('document', 'a41a93253c937697e900e19af172490d'))
 paddle.fluid.layers.pixel_shuffle (ArgSpec(args=['x', 'upscale_factor'], varargs=None, keywords=None, defaults=None), ('document', '7e5cac851fd9bad344230e1044b6a565'))
 paddle.fluid.layers.fsp_matrix (ArgSpec(args=['x', 'y'], varargs=None, keywords=None, defaults=None), ('document', 'd803767ef4fb885013a28c98634e0bc4'))
-paddle.fluid.layers.continuous_value_model (ArgSpec(args=['input', 'cvm', 'use_cvm'], varargs=None, keywords=None, defaults=(True,)), ('document', 'c03490ffaa1b78258747157c313db4cd'))
+paddle.fluid.layers.continuous_value_model (ArgSpec(args=['input', 'cvm', 'use_cvm'], varargs=None, keywords=None, defaults=(True,)), ('document', 'b335b531931cc8b2d19c65980eadfc1e'))
 paddle.fluid.layers.where (ArgSpec(args=['condition'], varargs=None, keywords=None, defaults=None), ('document', 'b1e1487760295e1ff55307b880a99e18'))
 paddle.fluid.layers.sign (ArgSpec(args=['x'], varargs=None, keywords=None, defaults=None), ('document', 'b56afe9ae3fc553c95d907fd7ef6c314'))
 paddle.fluid.layers.deformable_conv (ArgSpec(args=['input', 'offset', 'mask', 'num_filters', 'filter_size', 'stride', 'padding', 'dilation', 'groups', 'deformable_groups', 'im2col_step', 'param_attr', 'bias_attr', 'modulated', 'name'], varargs=None, keywords=None, defaults=(1, 0, 1, None, None, None, None, None, True, None)), ('document', '9b9c9d1282f994ccd4538201e0b6856f'))

python/paddle/fluid/data_feed_desc.py

@@ -92,7 +92,7 @@ class DataFeedDesc(object):
 
     def set_batch_size(self, batch_size):
         """
-        Set batch size. Will be effective during training
+        Set :attr:`batch_size` in :ref:`api_fluid_DataFeedDesc` . :attr:`batch_size` can be changed during training.
 
         Example:
             .. code-block:: python
@@ -120,16 +120,20 @@ class DataFeedDesc(object):
               data_feed.set_batch_size(128)
 
         Args:
-            batch_size: batch size
+            batch_size (int): The number of batch size.
+
+        Returns:
+            None.
 
         """
         self.proto_desc.batch_size = batch_size
 
     def set_dense_slots(self, dense_slots_name):
         """
-        Set if a specific slot will be dense. Will be effective during training.
-        features for a dense slot will be fed into a Tensor, while those for a
-        sparse slot will be fed into a LoDTensor
+        Set slots in :attr:`dense_slots_name` as dense slots. **Note: In default, all slots are sparse slots.**
+ 
+        Features for a dense slot will be fed into a Tensor, while those for a
+        sparse slot will be fed into a LoDTensor.
 
         Example:
             .. code-block:: python
@@ -157,10 +161,11 @@ class DataFeedDesc(object):
               data_feed.set_dense_slots(['words'])
 
         Args:
-            dense_slots_name: a list of slot names which will be set dense
+            dense_slots_name (list(str)): a list of slot names which will be set dense.
+
+        Returns:
+            None.
 
-        Note:
-            Default is sparse for all slots
         """
         if self.proto_desc.name != "MultiSlotDataFeed":
             raise ValueError(

python/paddle/fluid/layers/nn.py

@@ -14878,32 +14878,34 @@ def continuous_value_model(input, cvm, use_cvm=True):
 
     **continuous_value_model layers**
 
-    continuous value model(cvm). Now, it only considers show and click value in CTR project.
-    We assume that input is an embedding vector with cvm_feature, whose shape is [N * D] (D is 2 + embedding dim).
-    If use_cvm is True, it will log(cvm_feature), and output shape is [N * D].
-    If use_cvm is False, it will remove cvm_feature from input, and output shape is [N * (D - 2)].
-    
-    This layer accepts a tensor named input which is ID after embedded(lod level is 1), cvm is a show_click info.
+    Now, this OP is used in CTR project to remove or dispose show and click value in :attr:`input`.
 
-    Args:
+    :attr:`input` is an embedding vector including show and click value, whose shape is :math:`[N, D]` (N is batch size. D is `2 + embedding dim` ).
+    Show and click at first two dims of embedding vector D.
+    If :attr:`use_cvm` is True, it will caculate :math:`log(show)` and :math:`log(click)` , and output shape is :math:`[N, D]` .
+    If :attr:`use_cvm` is False, it will remove show and click from :attr:`input` , and output shape is :math:`[N, D - 2]` .
+    :attr:`cvm` is show_click info, whose shape is :math:`[N, 2]` .
 
-        input (Variable): a 2-D LodTensor with shape [N x D], where N is the batch size, D is 2 + the embedding dim. lod level = 1.
-        cvm (Variable):   a 2-D Tensor with shape [N x 2], where N is the batch size, 2 is show and click.
-        use_cvm  (bool):  use cvm or not. if use cvm, the output dim is the same as input
-                          if don't use cvm, the output dim is input dim - 2(remove show and click)
-                          (cvm op is a customized op, which input is a sequence has embed_with_cvm default, so we need an op named cvm to decided whever use it or not.)
+    Args:
+        input (Variable): The input variable. A 2-D LoDTensor with shape :math:`[N, D]` , where N is the batch size, D is `2 + the embedding dim` . `lod level = 1` .
+        A Tensor with type float32, float64.
+        cvm (Variable): Show and click variable. A 2-D Tensor with shape :math:`[N, 2]` , where N is the batch size, 2 is show and click.
+        A Tensor with type float32, float64.
+        use_cvm  (bool):  Use show_click or not. if use, the output dim is the same as input.
+                          if not use, the output dim is `input dim - 2` (remove show and click)
 
     Returns:
 
-        Variable: A 2-D LodTensor with shape [N x D], if use cvm, D is equal to input dim, if don't use cvm, D is equal to input dim - 2. 
+        Variable: A 2-D LodTensor with shape :math:`[N, M]` . if :attr:`use_cvm` = True, M is equal to input dim D. if False, M is equal to `D - 2`. \
+        A Tensor with same type as input.
 
     Examples:
 
         .. code-block:: python
 
           import paddle.fluid as fluid
-          input = fluid.layers.data(name="input", shape=[-1, 1], lod_level=1, append_batch_size=False, dtype="int64")#, stop_gradient=False)
-          label = fluid.layers.data(name="label", shape=[-1, 1], append_batch_size=False, dtype="int64")
+          input = fluid.data(name="input", shape=[64, 1], dtype="int64")
+          label = fluid.data(name="label", shape=[64, 1], dtype="int64")
           embed = fluid.layers.embedding(
                             input=input,
                             size=[100, 11],