sink pad and slice

src/ngraph/pass/reshape_sinking.cpp

@@ -29,10 +29,13 @@
 #include "ngraph/op/convolution.hpp"
 #include "ngraph/op/dequantize.hpp"
 #include "ngraph/op/get_output_element.hpp"
+#include "ngraph/op/pad.hpp"
 #include "ngraph/op/quantize.hpp"
 #include "ngraph/op/reshape.hpp"
+#include "ngraph/op/slice.hpp"
 #include "ngraph/op/util/binary_elementwise_arithmetic.hpp"
 #include "ngraph/op/util/unary_elementwise_arithmetic.hpp"
+#include "ngraph/pattern/op/label.hpp"
 #include "ngraph/util.hpp"
 
 using namespace ngraph;
@@ -41,11 +44,30 @@ extern template ngraph::AxisVector
     ngraph::apply_permutation<ngraph::AxisVector>(ngraph::AxisVector input,
                                                   ngraph::AxisVector order);
 
+extern template ngraph::Coordinate
+    ngraph::apply_permutation<ngraph::Coordinate>(ngraph::Coordinate input,
+                                                  ngraph::AxisVector order);
+
+extern template ngraph::Strides
+    ngraph::apply_permutation<ngraph::Strides>(ngraph::Strides input, ngraph::AxisVector order);
+
 extern template ngraph::Shape ngraph::apply_permutation<ngraph::Shape>(ngraph::Shape input,
                                                                        ngraph::AxisVector order);
 
 using ReshapeMap = std::unordered_map<std::shared_ptr<Node>, std::shared_ptr<op::Reshape>>;
 
+static std::string describe_reshape(std::shared_ptr<Node> node)
+{
+    std::stringstream ss;
+    auto reshape = std::dynamic_pointer_cast<op::Reshape>(node);
+    ss << reshape->get_name()
+       << " ( axis order = " << ngraph::vector_to_string(reshape->get_input_order())
+       << " , shape = " << vector_to_string(reshape->get_shape()) << " ) "
+       << " , child = " << reshape->get_argument(0)->get_name();
+
+    return ss.str();
+}
+
 static std::shared_ptr<op::Reshape> combine_reshapes(std::shared_ptr<op::Reshape> r1,
                                                      std::shared_ptr<op::Reshape> r2)
 {
@@ -64,18 +86,6 @@ static void
     target->get_inputs().at(input_index).replace_output(new_reshape->get_outputs().at(0));
 }
 
-std::string describe_reshape(std::shared_ptr<Node> node)
-{
-    std::stringstream ss;
-    auto reshape = std::dynamic_pointer_cast<op::Reshape>(node);
-    ss << reshape->get_name()
-       << " ( axis order = " << ngraph::vector_to_string(reshape->get_input_order())
-       << " , shape = " << vector_to_string(reshape->get_shape()) << " ) "
-       << " , child = " << reshape->get_argument(0)->get_name();
-
-    return ss.str();
-}
-
 static void delete_reshape(std::shared_ptr<Node> reshape)
 {
     NGRAPH_DEBUG << "Removing reshape " << reshape->get_name();
@@ -256,6 +266,7 @@ static void sink_reshape(std::shared_ptr<op::Reshape> reshape,
         mark_reshape_for_deletion(orig_reshape, reshapes_to_delete);
         //replace reshape with combined one
         ngraph::replace_node(reshape, new_reshape);
+        mark_reshape_for_deletion(new_reshape, reshapes_to_delete);
         reorders[new_reshape] = new_reshape;
         NGRAPH_DEBUG << "Combining " << describe_reshape(orig_reshape) << " and"
                      << describe_reshape(reshape) << " into  " << describe_reshape(new_reshape);
@@ -309,6 +320,61 @@ static void sink_binary(std::shared_ptr<op::util::BinaryElementwiseArithmetic> b
     }
 }
 
+static void sink_slice(std::shared_ptr<op::Slice> n,
+                       ReshapeMap& reorders,
+                       std::set<std::shared_ptr<Node>>& reshapes_to_delete)
+{
+    auto arg_reshape = reorders.at(n->get_argument(0));
+    auto order = arg_reshape->get_input_order();
+
+    // we need the correct input shape to produce the right output shape
+    // we are going to create a label of the right input shape,
+    // so a new slice will have the right shape
+    auto def_order = ngraph::get_permutation_to_default_order(order);
+    auto input_shape = ngraph::apply_permutation(arg_reshape->get_shape(), def_order);
+    auto dummy_correct_shape =
+        std::make_shared<pattern::op::Label>(arg_reshape->get_element_type(), input_shape);
+
+    auto new_lower = ngraph::apply_permutation(n->get_lower_bounds(), def_order);
+    auto new_upper = ngraph::apply_permutation(n->get_upper_bounds(), def_order);
+    auto new_strides = ngraph::apply_permutation(n->get_strides(), def_order);
+    auto new_slice =
+        std::make_shared<op::Slice>(dummy_correct_shape, new_lower, new_upper, new_strides);
+    ngraph::replace_node(dummy_correct_shape, n->get_argument(0));
+    NGRAPH_DEBUG << "Replacing " << n->get_name() << " with " << new_slice->get_name();
+    ngraph::replace_node(n, new_slice);
+
+    auto new_reshape = std::make_shared<op::Reshape>(new_slice, order, n->get_shape());
+    NGRAPH_DEBUG << "Propagating " << describe_reshape(new_reshape) << " for " << n->get_name();
+    reorders[new_slice] = new_reshape;
+}
+
+static void sink_pad(std::shared_ptr<op::Pad> n,
+                     ReshapeMap& reorders,
+                     std::set<std::shared_ptr<Node>>& reshapes_to_delete)
+{
+    auto arg_reshape = reorders.at(n->get_argument(0));
+    auto order = arg_reshape->get_input_order();
+    // we need the correct input shape to produce the right output shape
+    // we are going to create a label of the right input shape,
+    // so a new pad will have the right shape
+    auto def_order = ngraph::get_permutation_to_default_order(order);
+    auto input_shape = ngraph::apply_permutation(arg_reshape->get_shape(), def_order);
+    auto dummy_correct_shape =
+        std::make_shared<pattern::op::Label>(arg_reshape->get_element_type(), input_shape);
+
+    auto new_lower = ngraph::apply_permutation(n->get_padding_below(), def_order);
+    auto new_upper = ngraph::apply_permutation(n->get_padding_above(), def_order);
+    auto new_interior = ngraph::apply_permutation(n->get_padding_interior(), def_order);
+    auto new_pad = std::make_shared<op::Pad>(
+        dummy_correct_shape, n->get_argument(1), new_lower, new_upper, new_interior);
+    ngraph::replace_node(dummy_correct_shape, n->get_argument(0));
+    NGRAPH_DEBUG << "Replacing " << n->get_name() << " with " << new_pad->get_name();
+    ngraph::replace_node(n, new_pad);
+    auto new_reshape = std::make_shared<op::Reshape>(new_pad, order, n->get_shape());
+    NGRAPH_DEBUG << "Propagating " << describe_reshape(new_reshape) << " for " << n->get_name();
+    reorders[new_pad] = new_reshape;
+}
 static void sink_quantize(std::shared_ptr<op::Quantize> quantize,
                           ReshapeMap& reorders,
                           std::set<std::shared_ptr<Node>>& reshapes_to_delete)
@@ -419,6 +485,14 @@ bool ngraph::pass::ReshapeSinking::run_on_function(std::shared_ptr<ngraph::Funct
         {
             sink_dequantize(dequantize, reorders, reshapes_to_delete);
         }
+        else if (auto slice = std::dynamic_pointer_cast<op::Slice>(n))
+        {
+            sink_slice(slice, reorders, reshapes_to_delete);
+        }
+        else if (auto pad = std::dynamic_pointer_cast<op::Pad>(n))
+        {
+            sink_pad(pad, reorders, reshapes_to_delete);
+        }
         else
         {
             materialize_shapes(n, reorders, reshapes_to_delete);

src/ngraph/util.cpp

@@ -478,6 +478,10 @@ T ngraph::apply_permutation(T input, AxisVector order)
 
 template AxisVector ngraph::apply_permutation<AxisVector>(AxisVector input, AxisVector order);
 template Shape ngraph::apply_permutation<Shape>(Shape input, AxisVector order);
+template ngraph::Coordinate ngraph::apply_permutation<ngraph::Coordinate>(ngraph::Coordinate input,
+                                                                          ngraph::AxisVector order);
+template ngraph::Strides ngraph::apply_permutation<ngraph::Strides>(ngraph::Strides input,
+                                                                    ngraph::AxisVector order);
 
 AxisVector ngraph::get_default_order(const Shape& shape)
 {

test/reshape_sinking.cpp

@@ -163,3 +163,57 @@ TEST(reshape_sinking, nasnet_pooladd)
     size_t before_after = count_ops_of_type<op::Reshape>(func);
     ASSERT_LE(before_after, before_count);
 }
+
+TEST(reshape_sinking, slice_pad)
+{
+    Shape shape_a{1, 8, 8, 1};
+
+    AxisVector to_nhwc{0, 2, 3, 1};
+    AxisVector to_nchw{0, 3, 1, 2};
+
+    auto A = make_shared<op::Parameter>(element::f32, shape_a);
+    auto pad_value = op::Constant::create<float>(element::f32, Shape{}, std::vector<float>{0.0f});
+
+    Shape padding_below{0, 0, 0, 0};
+    Shape padding_above{0, 1, 1, 0};
+    Shape padding_interior{0, 0, 0, 0};
+
+    auto reshape1 = make_shared<op::Reshape>(A, to_nchw, Shape{1, 1, 8, 8});
+    auto maxpool =
+        make_shared<op::MaxPool>(reshape1, Shape{1, 1}, Strides{2, 2}, Shape{0, 0}, Shape{0, 0});
+    auto reshape2 = make_shared<op::Reshape>(maxpool, to_nhwc, Shape{1, 4, 4, 1});
+    auto pad =
+        make_shared<op::Pad>(reshape2, pad_value, padding_below, padding_above, padding_interior);
+    auto slice = make_shared<op::Slice>(
+        pad, Coordinate{0, 1, 1, 0}, Coordinate{1, 5, 5, 1}, Strides{1, 1, 1, 1});
+
+    auto reshape3 = make_shared<op::Reshape>(slice, to_nchw, Shape{1, 1, 4, 4});
+    auto avgpool = make_shared<op::AvgPool>(reshape3, Shape{1, 1}, Strides{2, 2});
+    auto reshape4 = make_shared<op::Reshape>(avgpool, to_nhwc, Shape{1, 1, 2, 2});
+    auto f = make_shared<Function>(reshape4, ParameterVector{A});
+
+    // auto reshape1 = make_shared<op::Reshape>(A, to_nchw, Shape{1, 1, 4, 4});
+    // auto pad = make_shared<op::Pad>(reshape1, pad_value, padding_below, padding_above, padding_interior);
+    // auto reshape2 = make_shared<op::Reshape>(pad, to_nhwc, Shape{1, 5, 5, 1});
+    // auto absn  = make_shared<op::Abs>(reshape2);
+    // auto reshape3 = make_shared<op::Reshape>(absn, to_nchw, Shape{1, 1, 5, 5});
+    // auto slice = make_shared<op::Slice>(
+    //     reshape3, Coordinate{0, 0, 1, 1}, Coordinate{1, 1, 5, 5}, Strides{1, 1, 1, 1});
+    // auto reshape4 = make_shared<op::Reshape>(slice, to_nhwc, Shape{1, 4, 4, 1});
+    // auto absn2  = make_shared<op::Abs>(reshape4);
+    // auto reshape5 = make_shared<op::Reshape>(absn2, to_nchw, Shape{1, 1, 4, 4});
+    // auto avgpool = make_shared<op::AvgPool>(reshape5, Shape{1, 1}, Strides{2, 2});
+    // auto reshape6 = make_shared<op::Reshape>(avgpool, to_nhwc, Shape{1, 1, 2, 2});
+    // auto f = make_shared<Function>(reshape6, ParameterVector{A});
+
+    pass::Manager pass_manager;
+    size_t before_count = count_ops_of_type<op::Reshape>(f);
+    pass_manager.register_pass<pass::VisualizeTree>("before.pdf");
+    pass_manager.register_pass<pass::ReshapeSinking>();
+    pass_manager.register_pass<pass::ReshapeElimination>();
+    pass_manager.register_pass<pass::CommonSubexpressionElimination>();
+    pass_manager.register_pass<pass::VisualizeTree>("after.pdf");
+    pass_manager.run_passes(f);
+    size_t before_after = count_ops_of_type<op::Reshape>(f);
+    ASSERT_LE(before_after, before_count);
+}
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