yolov5 updated to v4.0

Author: wang-xinyu

yolov5/README.md

@@ -2,10 +2,10 @@
 
 The Pytorch implementation is [ultralytics/yolov5](https://github.com/ultralytics/yolov5).
 
-Currently, we support yolov5 v1.0(yolov5s only), v2.0, v3.0 and v3.1.
+Currently, we support yolov5 v1.0(yolov5s only), v2.0, v3.0, v3.1 and v4.0.
 
-- For yolov5 v3.1, please visit [yolov5 release v3.1](https://github.com/ultralytics/yolov5/releases/tag/v3.1), and use the latest commit of this repo.
-- For yolov5 v3.0, please visit [yolov5 release v3.0](https://github.com/ultralytics/yolov5/releases/tag/v3.0), and use the latest commit of this repo.
+- For yolov5 v4.0, please visit [yolov5 release v4.0](https://github.com/ultralytics/yolov5/releases/tag/v4.0), and use the latest commit of this repo.
+- For yolov5 v3.0 and v3.1, please visit [yolov5 release v3.0](https://github.com/ultralytics/yolov5/releases/tag/v3.0) and [yolov5 release v3.1](https://github.com/ultralytics/yolov5/releases/tag/v3.1), and checkout commit ['6d0f5cb'](https://github.com/wang-xinyu/tensorrtx/commit/6d0f5cbf4745bc00b69aad54a905383fb906f103) of this repo.
 - For yolov5 v2.0, please visit [yolov5 release v2.0](https://github.com/ultralytics/yolov5/releases/tag/v2.0), and checkout commit ['5cfa444'](https://github.com/wang-xinyu/tensorrtx/commit/5cfa4445170eabaa54acd5ad7f469ef65a8763f1) of this repo.
 - For yolov5 v1.0, please visit [yolov5 release v1.0](https://github.com/ultralytics/yolov5/releases/tag/v1.0), and checkout commit ['f09aa3b'](https://github.com/wang-xinyu/tensorrtx/commit/f09aa3bbebf4d4d37b6d3b32a1d39e1f2678a07b) of this repo.
 

yolov5/common.hpp

@@ -200,12 +200,10 @@ ILayer* convBlock(INetworkDefinition *network, std::map<std::string, Weights>& w
     conv1->setNbGroups(g);
     IScaleLayer* bn1 = addBatchNorm2d(network, weightMap, *conv1->getOutput(0), lname + ".bn", 1e-3);
 
-    // hard_swish = x * hard_sigmoid
-    auto hsig = network->addActivation(*bn1->getOutput(0), ActivationType::kHARD_SIGMOID);
-    assert(hsig);
-    hsig->setAlpha(1.0 / 6.0);
-    hsig->setBeta(0.5);
-    auto ew = network->addElementWise(*bn1->getOutput(0), *hsig->getOutput(0), ElementWiseOperation::kPROD);
+    // silu = x * sigmoid
+    auto sig = network->addActivation(*bn1->getOutput(0), ActivationType::kSIGMOID);
+    assert(sig);
+    auto ew = network->addElementWise(*bn1->getOutput(0), *sig->getOutput(0), ElementWiseOperation::kPROD);
     assert(ew);
     return ew;
 }
@@ -254,6 +252,23 @@ ILayer* bottleneckCSP(INetworkDefinition *network, std::map<std::string, Weights
     return cv4;
 }
 
+ILayer* C3(INetworkDefinition *network, std::map<std::string, Weights>& weightMap, ITensor& input, int c1, int c2, int n, bool shortcut, int g, float e, std::string lname) {
+    int c_ = (int)((float)c2 * e);
+    auto cv1 = convBlock(network, weightMap, input, c_, 1, 1, 1, lname + ".cv1");
+    auto cv2 = convBlock(network, weightMap, input, c_, 1, 1, 1, lname + ".cv2");
+    ITensor *y1 = cv1->getOutput(0);
+    for (int i = 0; i < n; i++) {
+        auto b = bottleneck(network, weightMap, *y1, c_, c_, shortcut, g, 1.0, lname + ".m." + std::to_string(i));
+        y1 = b->getOutput(0);
+    }
+
+    ITensor* inputTensors[] = { y1, cv2->getOutput(0) };
+    auto cat = network->addConcatenation(inputTensors, 2);
+
+    auto cv3 = convBlock(network, weightMap, *cat->getOutput(0), c2, 1, 1, 1, lname + ".cv3");
+    return cv3;
+}
+
 ILayer* SPP(INetworkDefinition *network, std::map<std::string, Weights>& weightMap, ITensor& input, int c1, int c2, int k1, int k2, int k3, std::string lname) {
     int c_ = c1 / 2;
     auto cv1 = convBlock(network, weightMap, input, c_, 1, 1, 1, lname + ".cv1");