Add document to random crop operator

paddle/fluid/operators/random_crop_op.cc

@@ -36,11 +36,11 @@ 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. 
-      It means that cropping positions differs on each instance, which is determined 
+      This operator takes a batch of instance, and do random cropping on each instance.
+      It means that cropping positions differs on each instance, which is determined
       by an uniform random generator. All cropped instances have the same shape, which 
       is determined by the operator's attribute 'shape'.
     )DOC");

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")