Merge branch 'master' into jonathac/windows_build

1 files changed, 39 insertions, 0 deletions

diff --git a/src/graph/node_operators_unary.h b/src/graph/node_operators_unary.h
index e14f6546..259e6072 100644
--- a/src/graph/node_operators_unary.h
+++ b/src/graph/node_operators_unary.h
@@ -99,6 +99,45 @@ public:
   }
 };
 
+struct ClipNodeOp : public UnaryNodeOp {
+private:
+  float clip_{0};
+
+public:
+  ClipNodeOp(Expr a, float clip) : UnaryNodeOp(a), clip_{clip} {}
+
+  NodeOps forwardOps() {
+    using namespace functional;
+    return {NodeOp(Element(_1 = clip(_2, clip_), val_, child(0)->val()))};
+  }
+
+  NodeOps backwardOps() {
+    using namespace functional;
+    return {NodeOp(Add(bump(_1, clip_) * _2, child(0)->grad(), child(0)->val(), adj_))};
+  }
+
+  const std::string type() { return "clip"; }
+
+  virtual size_t hash() {
+    if(!hash_) {
+      hash_ = NaryNodeOp::hash();
+      boost::hash_combine(hash_, clip_);
+    }
+    return hash_;
+  }
+
+  virtual bool equal(Expr node) {
+    if(!NaryNodeOp::equal(node))
+      return false;
+    auto cnode = std::dynamic_pointer_cast<ClipNodeOp>(node);
+    if(!cnode)
+      return false;
+    if(clip_ != cnode->clip_)
+      return false;
+    return true;
+  }
+};
+
 struct LogitNodeOp : public UnaryNodeOp {
   LogitNodeOp(Expr a) : UnaryNodeOp(a) {}