Expose Net to Python

* Expose PlainNet to Python, make python can add_op, complete_add_op
* Provide a low level api to manipulate Net
* Unittest for Net::DebugString

paddle/framework/net.cc

@@ -61,7 +61,10 @@ std::string PlainNet::DebugString() const {
   std::ostringstream os;
   os << this->type_ << ":" << std::endl;
   for (auto& op : ops_) {
-    os << "\t" << op->DebugString() << std::endl;
+    std::istringstream is(op->DebugString());
+    for (std::string line; std::getline(is, line);) {
+      os << "    " << line << std::endl;
+    }
   }
   return os.str();
 }

paddle/pybind/pybind.cc

@@ -13,15 +13,16 @@ See the License for the specific language governing permissions and
 limitations under the License. */
 
 #include <Python.h>
-#include <paddle/framework/op_registry.h>
-#include <paddle/framework/operator.h>
-#include <paddle/framework/scope.h>
-#include <paddle/pybind/tensor_bind.h>
-#include <pybind11/numpy.h>
-#include <pybind11/pybind11.h>
-#include <pybind11/stl.h>
 #include <fstream>
 #include <vector>
+#include "paddle/framework/net.h"
+#include "paddle/framework/op_registry.h"
+#include "paddle/framework/operator.h"
+#include "paddle/framework/scope.h"
+#include "paddle/pybind/tensor_bind.h"
+#include "pybind11/numpy.h"
+#include "pybind11/pybind11.h"
+#include "pybind11/stl.h"
 
 namespace py = pybind11;
 namespace pd = paddle::framework;
@@ -29,6 +30,17 @@ namespace pd = paddle::framework;
 USE_OP(add_two);
 USE_OP_WITHOUT_KERNEL(fc);
 
+template <typename ClassType>
+void ExposeOperator(ClassType& m) {
+  m.def("infer_shape", &ClassType::type::InferShape)
+      .def("run", &ClassType::type::Run)
+      .def("outputs",
+           [](const typename ClassType::type& op) -> std::vector<std::string> {
+             return op.outputs_;
+           })
+      .def("__str__", &ClassType::type::DebugString);
+}
+
 PYBIND11_PLUGIN(core) {
   py::module m("core", "C++ core of Paddle Paddle");
 
@@ -107,21 +119,36 @@ All parameter, weight, gradient are variables in Paddle.
         return new paddle::platform::CPUDeviceContext();
       });
 
-  py::class_<pd::OperatorBase, pd::OperatorPtr>(m, "Operator")
-      .def("__str__", &pd::OperatorBase::DebugString)
-      .def_static("create",
-                  [](py::bytes protobin) {
-                    pd::OpDesc desc;
-                    PADDLE_ENFORCE(desc.ParsePartialFromString(protobin),
-                                   "Cannot parse user input to OpDesc");
-                    PADDLE_ENFORCE(desc.IsInitialized(),
-                                   "User OpDesc is not initialized, reason %s",
-                                   desc.InitializationErrorString());
-                    return pd::OpRegistry::CreateOp(desc);
-                  })
-      .def("infer_shape", &pd::OperatorBase::InferShape)
-      .def("run", &pd::OperatorBase::Run)
-      .def("outputs", [](const pd::OperatorPtr& op) { return op->outputs_; });
+  py::class_<pd::OperatorBase, pd::OperatorPtr> operator_base(m, "Operator");
+
+  operator_base.def_static("create", [](py::bytes protobin) -> pd::OperatorPtr {
+    pd::OpDesc desc;
+    PADDLE_ENFORCE(desc.ParsePartialFromString(protobin),
+                   "Cannot parse user input to OpDesc");
+    PADDLE_ENFORCE(desc.IsInitialized(),
+                   "User OpDesc is not initialized, reason %s",
+                   desc.InitializationErrorString());
+    return pd::OpRegistry::CreateOp(desc);
+  });
+  ExposeOperator(operator_base);
+
+  using PlainNetPtr = std::shared_ptr<pd::PlainNet>;
+  py::class_<pd::PlainNet, PlainNetPtr> net(m, "Net");
+
+  net.def_static("create",
+                 []() -> std::shared_ptr<pd::PlainNet> {
+                   auto retv = std::make_shared<pd::PlainNet>();
+                   retv->type_ = "naive_net";
+                   return retv;
+                 })
+      .def("add_op", &pd::PlainNet::AddOp)
+      .def("add_op",
+           [](PlainNetPtr& self, const PlainNetPtr& net) -> void {
+             self->AddOp(std::static_pointer_cast<pd::OperatorBase>(net));
+           })
+      .def("complete_add_op", &pd::PlainNet::CompleteAddOp)
+      .def("complete_add_op", [](PlainNetPtr& self) { self->CompleteAddOp(); });
+  ExposeOperator(net);
 
   return m.ptr();
 }

python/paddle/v2/framework/tests/test_net.py

+import paddle.v2.framework.core as core
+from paddle.v2.framework.create_op_creation_methods import op_creations
+import unittest
+
+
+class TestNet(unittest.TestCase):
+    def test_net_all(self):
+        net = core.Net.create()
+        op1 = op_creations.add_two(X="X", Y="Y", Out="Out")
+        net.add_op(op1)
+
+        net2 = core.Net.create()
+        net2.add_op(op_creations.fc(X="X", W="w", Y="fc.out"))
+        net2.complete_add_op(True)
+        net.add_op(net2)
+        net.complete_add_op(True)
+        expected = '''naive_net:
+    Op(add_two), inputs:(X, Y), outputs:(Out).
+    naive_net:
+        fc:
+            Op(mul), inputs:(X, w), outputs:(@TEMP@fc@0).
+            Op(sigmoid), inputs:(@TEMP@fc@0), outputs:(fc.out).
+'''
+        self.assertEqual(expected, str(net))
+
+
+if __name__ == '__main__':
+    unittest.main()