[Pass] Finish infershape testcase (#16)

nnvm/include/nnvm/pass.h

@@ -23,15 +23,15 @@ namespace nnvm {
  * \param src The graph to be transformed.
  * \return The generated graph.
  */
-typedef std::function<Graph (const Graph& src)> PassFunction;
+typedef std::function<Graph (Graph src)> PassFunction;
 
 /*!
  * \brief Apply a series of pass transformations on g.
  * \param src The graph to be transformed.
  * \param pass The name of pass to be applied.
  * \return The transformed graph
  */
-Graph ApplyPass(const Graph& src,
+Graph ApplyPass(Graph src,
                 const std::vector<std::string>& pass);
 
 /*!

nnvm/include/nnvm/pass_functions.h

@@ -0,0 +1,76 @@
+/*!
+ *  Copyright (c) 2016 by Contributors
+ * \file pass_functions.h
+ * \brief Pass functions that simply redirect the calls to ApplyPass
+ *
+ *  This file serves as documentation on how to use functions implemented in "src/pass".
+ *  It is totally optional to add these functions when you add a new pass, since
+ *  ApplyPass can be directly called.
+ */
+#ifndef NNVM_PASS_FUNCTIONS_H_
+#define NNVM_PASS_FUNCTIONS_H_
+
+#include <string>
+#include <memory>
+#include "./base.h"
+#include "./pass.h"
+#include "./graph_attr_types.h"
+
+namespace nnvm {
+namespace pass {
+
+/*!
+ * \brief Load a graph from JSON string, redirects to "LoadJSON" pass.
+ * \param json_str The json string.
+ * \return Loaded graph.
+ */
+inline Graph LoadJSON(const std::string& json_str) {
+  Graph ret;
+  ret.attrs["json"] = std::make_shared<any>(json_str);
+  return ApplyPass(ret, {"LoadJSON"});
+}
+
+/*!
+ * \brief Save a graph to json, redirects to "SaveJSON" pass.
+ * \param graph The to be saved.
+ * \return The json string.
+ */
+inline std::string SaveJSON(Graph graph) {
+  Graph ret = ApplyPass(std::move(graph), {"SaveJSON"});
+  return ret.GetAttr<std::string>("json");
+}
+
+/*!
+ * \brief Add control flow dependencies between nodes
+ *  To correctly order mutation and read to resolve
+ *  write after read problem and read after write problems.
+ * \param src source graph
+ * \return A graph that added control flow dependencies.
+ */
+inline Graph OrderMutation(Graph src) {
+  return ApplyPass(std::move(src), {"OrderMutation"});
+}
+
+/*!
+ * \brief Infer shapes in the graph given the information.
+ * \param graph source graph
+ * \param shape_args The shapes of aruguments to the graph.
+ * \param shape_attr_key The key to the node attribute that can indicate shape.
+ * \return A graph with new attribute "shape" containing inferred shape of each NodeEntry.
+ *  The index of ShapeVector is given by graph.indexed_graph().entry_id
+ */
+inline Graph InferShape(Graph graph,
+                        ShapeVector shape_args = {},
+                        std::string shape_attr_key = "") {
+  if (shape_args.size() != 0) {
+    graph.attrs["shape_args"] = std::make_shared<any>(std::move(shape_args));
+  }
+  if (shape_attr_key.length() != 0) {
+    graph.attrs["shape_attr_key"] = std::make_shared<any>(std::move(shape_attr_key));
+  }
+  return ApplyPass(std::move(graph), {"InferShape"});
+}
+
+}  // namespace pass
+}  // namespace nnvm
+#endif  // NNVM_PASS_FUNCTIONS_H_

nnvm/src/core/pass.cc

@@ -22,7 +22,7 @@ const PassFunctionReg* FindPassDep(const std::string&attr_name) {
   return nullptr;
 }
 
-Graph ApplyPass(const Graph& src,
+Graph ApplyPass(Graph g,
                 const std::vector<std::string>& pass) {
   std::vector<const PassFunctionReg*> fpass;
   for (auto& name : pass) {
@@ -32,11 +32,9 @@ Graph ApplyPass(const Graph& src,
     fpass.push_back(reg);
   }
 
-  Graph g;
-  const Graph* s = &src;
   for (auto r : fpass) {
     for (auto& dep : r->graph_attr_dependency) {
-      if (s->attrs.count(dep) == 0) {
+      if (g.attrs.count(dep) == 0) {
         auto* pass_dep = FindPassDep(dep);
         std::string msg;
         if (pass_dep != nullptr) {
@@ -48,8 +46,7 @@ Graph ApplyPass(const Graph& src,
                    << msg;
       }
     }
-    g = r->body(*s);
-    s = &g;
+    g = r->body(std::move(g));
   }
   return g;
 }

nnvm/src/example/operator.cc

@@ -4,6 +4,7 @@
 #include <nnvm/base.h>
 #include <nnvm/op.h>
 #include <nnvm/op_attr_types.h>
+#include <nnvm/node.h>
 #include <nnvm/graph_attr_types.h>
 #include <utility>
 
@@ -30,6 +31,31 @@ inline bool SameShape(const NodeAttrs& attrs,
   return true;
 }
 
+// simple demonstration of reshape.
+NNVM_REGISTER_OP(reshape)
+.describe("reshape source to target shape")
+.set_num_inputs(1)
+.set_attr_parser(
+    [](NodeAttrs* attrs) {
+      // parse attr parser to get target attribute
+      TShape target;
+      std::istringstream is(attrs->dict.at("target"));
+      CHECK(is >> target);
+      attrs->parsed = std::move(target);
+    })
+.attr<FInferShape>(
+    "FInferShape", [] (const NodeAttrs& attrs,
+                       array_view<TShape*> ishape,
+                       array_view<TShape*> oshape) {
+      // get parsed attribute
+      const TShape& target = nnvm::get<TShape>(attrs.parsed);
+      *oshape[0] = target;
+      if (ishape[0]->ndim() == 0) return false;
+      CHECK_EQ(ishape[0]->Size(), target.Size())
+          << "Reshape op: source target shape mismatch";
+      return true;
+    });
+
 NNVM_REGISTER_OP(add)
 .describe("add two data together")
 .set_num_inputs(2)

nnvm/src/pass/infer_shape.cc

@@ -10,19 +10,42 @@
 namespace nnvm {
 namespace pass {
 
-Graph InferShape(const Graph& src) {
-  Graph ret = src;
+Graph InferShape(Graph ret) {
   const IndexedGraph& idx = ret.indexed_graph();
   static auto& finfer_shape = Op::GetAttr<FInferShape>("FInferShape");
   // reshape shape vector
   ShapeVector rshape(idx.num_node_entries());
+
+  if (ret.attrs.count("shape_args") != 0) {
+    const ShapeVector& shape_args = ret.GetAttr<ShapeVector>("shape_args");
+    CHECK_LE(shape_args.size(), idx.arg_nodes().size())
+        << "shape args is more than number of arguments";
+    for (size_t i = 0; i < shape_args.size(); ++i) {
+      rshape[idx.entry_id(idx.arg_nodes()[i], 0)] = shape_args[i];
+    }
+  }
+  std::string shape_attr_key;
+  if (ret.attrs.count("shape_attr_key") != 0) {
+    shape_attr_key = ret.GetAttr<std::string>("shape_attr_key");
+  }
+
   // temp space for shape inference.
   std::vector<TShape*> ishape, oshape;
   // number of completed nodes
   size_t num_known = 0;
   for (uint32_t nid = 0; nid < idx.num_nodes(); ++nid) {
     const auto& inode = idx[nid];
-    if (inode.source->is_variable()) continue;
+    if (inode.source->is_variable()) {
+      if (shape_attr_key.length() != 0) {
+        auto it = inode.source->attrs.dict.find(shape_attr_key);
+        if (it != inode.source->attrs.dict.end()) {
+          CHECK_EQ(inode.source->num_outputs(), 1);
+          std::istringstream is(it->second);
+          CHECK(is >> rshape[idx.entry_id(nid, 0)]) << "Invalid shape attribute";
+        }
+      }
+      continue;
+    }
     ishape.resize(inode.inputs.size());
     for (uint32_t i = 0; i < ishape.size(); ++i) {
       ishape[i] = &rshape[idx.entry_id(inode.inputs[i])];
@@ -43,5 +66,13 @@ Graph InferShape(const Graph& src) {
   return ret;
 }
 
+NNVM_REGISTER_PASS(InferShape)
+.describe("Infer the shape of each node entries.")
+.set_body(InferShape)
+.set_change_graph(false)
+.provide_graph_attr("shape");
+
+DMLC_JSON_ENABLE_ANY(ShapeVector, list_shape);
+
 }  // namespace pass
 }  // namespace nnvm

nnvm/src/pass/order_mutation.cc

@@ -1,6 +1,6 @@
 /*!
  *  Copyright (c) 2016 by Contributors
- * \file saveload_json.cc
+ * \file order_mutation.cc
  * \brief Add control flow dependencies between nodes
  *  To correctly order mutation and read to resolve
  *  write after read problem and read after write problems.

nnvm/src/pass/saveload_json.cc

@@ -149,7 +149,7 @@ struct JSONGraph {
 };
 
 // Load a graph from JSON file.
-Graph LoadJSON(const Graph& src) {
+Graph LoadJSON(Graph src) {
   CHECK_NE(src.attrs.count("json"), 0)
       << "Load JSON require json to be presented.";
   const std::string &json_str =
@@ -188,7 +188,7 @@ Graph LoadJSON(const Graph& src) {
 }
 
 // save a graph to json
-Graph SaveJSON(const Graph& src) {
+Graph SaveJSON(Graph src) {
   JSONGraph jgraph;
   std::unordered_map<Node*, uint32_t> node2index;
   jgraph.node_row_ptr.push_back(0);

nnvm/src/test_main.cc

@@ -4,6 +4,7 @@
 #include <nnvm/tuple.h>
 #include <nnvm/c_api.h>
 #include <nnvm/graph_attr_types.h>
+#include <nnvm/pass_functions.h>
 #include <dmlc/timer.h>
 #include <string>
 

nnvm/tests/python/test_graph.py

@@ -35,7 +35,23 @@ def test_order_mutation_pass():
     assert nindex['add1'] in jnodes[nindex['assign']]['control_deps']
     assert jnodes[nindex['assign']]['inputs'][0][2] == 1
 
+def test_infer_shape():
+    x = sym.Variable('x', shape=(4, 2))
+    y = sym.add(x, x, name='add1')
+    y = sym.reshape(y, target=(2, 4), name="reshape1")
+    g = graph.create(y)
+    g._set_json_attr("shape_attr_key", "shape")
+    g = g.apply('InferShape')
+    jgraph = json.loads(g.apply('SaveJSON').json_attr('json'))
+    jnodes = jgraph['nodes']
+    jnode_row_ptr = jgraph['node_row_ptr']
+    nindex = {n['name']: i for i, n in enumerate(jnodes)}
+    assert g.json_attr('shape')[jnode_row_ptr[nindex["reshape1"]]] == [2, 4]
+    assert g.json_attr('shape')[jnode_row_ptr[nindex["add1"]]] == [4, 2]
+
+
 if __name__ == "__main__":
     test_order_mutation_pass()
     test_graph_json_attr()
     test_json_pass()
+    test_infer_shape()