Add document to random crop operator

paddle/fluid/operators/random_crop_op.cc

@@ -36,7 +36,7 @@ class RandomCropOpMaker : public framework::OpProtoAndCheckerMaker {
     AddInput("Seed", "The random seed.");
     AddOutput("Out", "The cropped instance batch.");
     AddOutput("SeedOut", "The random seed after random cropping.")
-        .AsDispensable();
+        .AsIntermediate();
     AddAttr<std::vector<int>>("shape", "The shape of a cropped instance.");
     AddComment(R"DOC(
       This operator takes a batch of instance, and do random cropping on each instance.

python/paddle/fluid/layers/layer_function_generator.py

@@ -15,16 +15,13 @@ import re
 import cStringIO
 import functools
 import warnings
+import string
 
 from ..proto import framework_pb2
 from ..framework import OpProtoHolder, Variable
 from ..layer_helper import LayerHelper
 
-__all__ = [
-    'deprecated',
-    'generate_layer_fn',
-    'autodoc',
-]
+__all__ = ['deprecated', 'generate_layer_fn', 'autodoc', 'templatedoc']
 
 
 def _convert_(name):
@@ -43,6 +40,10 @@ def _convert_(name):
     return re.sub('([a-z0-9])([A-Z])', r'\1_\2', s1).lower()
 
 
+def _type_to_str_(tp):
+    return framework_pb2.AttrType.Name(tp)
+
+
 def _generate_doc_string_(op_proto):
     """
     Generate docstring by OpProto
@@ -54,9 +55,6 @@ def _generate_doc_string_(op_proto):
         str: the document string
     """
 
-    def _type_to_str_(tp):
-        return framework_pb2.AttrType.Name(tp)
-
     if not isinstance(op_proto, framework_pb2.OpProto):
         raise TypeError("OpProto should be `framework_pb2.OpProto`")
 
@@ -220,3 +218,42 @@ def autodoc(comment=""):
         return func
 
     return __impl__
+
+
+def templatedoc():
+    """
+    Decorator of layer function. It will use the docstring from the layer
+    function as the template. The template arguments are:
+
+    * ${comment}: The operator comment written in CPP.
+    * ${{name}_comment}: The comment of ${name} written with AddAttr, AddOutput,
+        and AddInput. The ${name} is Python snake style. i.e., xxx_xxx.
+    * ${{name}_type}: The type of ${name}.
+
+
+    Returns:
+        Decorated funciton.
+    """
+
+    def __impl__(func):
+        op_proto = OpProtoHolder.instance().get_op_proto(func.__name__)
+        tmpl = string.Template(func.__doc__)
+        args = {"comment": " ".join(op_proto.comment.split())}
+        for each_input in op_proto.inputs:
+            input_name = _convert_(each_input.name)
+            args["{0}_comment".format(input_name)] = each_input.comment
+            args["{0}_type".format(input_name)] = "Variable"
+        for each_attr in op_proto.attrs:
+            input_name = _convert_(each_attr.name)
+            args["{0}_comment".format(input_name)] = each_attr.comment
+            args["{0}_type".format(input_name)] = _type_to_str_(each_attr.type)
+
+        for each_opt in op_proto.outputs:
+            output_name = _convert_(each_opt.name)
+            args["{0}_comment".format(output_name)] = each_opt.comment
+            args["{0}_type".format(output_name)] = "Variable"
+
+        func.__doc__ = tmpl.substitute(args)
+        return func
+
+    return __impl__

python/paddle/fluid/layers/nn.py

@@ -19,9 +19,10 @@ from ..layer_helper import LayerHelper
 from ..initializer import Normal, Constant
 from ..framework import Variable
 from ..param_attr import ParamAttr
-from layer_function_generator import autodoc
+from layer_function_generator import autodoc, templatedoc
 from tensor import concat
 import utils
+import random
 
 __all__ = [
     'fc',
@@ -3992,10 +3993,34 @@ def upsampling_bilinear2d(input, out_shape=None, scale=None, name=None):
     return out
 
 
-def random_crop(input, shape, seed=1):
+@templatedoc()
+def random_crop(x, shape, seed=None):
+    """
+    **Random crop operator**
+    
+    ${comment}
+
+    Examples:
+        >>> img = fluid.layers.data("img", [3, 256, 256])
+        >>> cropped_img = fluid.layers.random_crop(img, shape=[3, 224, 224])
+
+    Args:
+        x(${x_type}): ${x_comment}
+        shape(${shape_type}): ${shape_comment}
+        seed(int|${seed_type}|None): ${seed_comment} By default, the seed will
+            get from `random.randint(-65536, 65535)`.
+
+    Returns:
+        ${out_comment}
+
+    """
+
     helper = LayerHelper("random_crop", **locals())
     dtype = helper.input_dtype()
     out = helper.create_tmp_variable(dtype)
+    if seed is None:
+        seed = random.randint(-65536, 65535)
+
     if isinstance(seed, int):
         seed_value = seed
         seed = helper.create_tmp_variable(dtype="int64")