fix layerSetUp of scale_layer to not add bias blob when already present

diff --git a/src/caffe/layers/scale_layer.cpp b/src/caffe/layers/scale_layer.cpp
index ecdbb12..e652dad 100644 (file)
--- a/src/caffe/layers/scale_layer.cpp
+++ b/src/caffe/layers/scale_layer.cpp
@@ -56,9 +56,17 @@ void ScaleLayer<Dtype>::LayerSetUp(const vector<Blob<Dtype>*>& bottom,
     bias_bottom_vec_.resize(1);
     bias_bottom_vec_[0] = bottom[0];
     bias_layer_->SetUp(bias_bottom_vec_, top);
-    bias_param_id_ = this->blobs_.size();
-    this->blobs_.resize(bias_param_id_ + 1);
-    this->blobs_[bias_param_id_] = bias_layer_->blobs()[0];
+    if (this->blobs_.size() + bottom.size() < 3) {
+      // case: blobs.size == 1 && bottom.size == 1
+      // or blobs.size == 0 && bottom.size == 2
+      bias_param_id_ = this->blobs_.size();
+      this->blobs_.resize(bias_param_id_ + 1);
+      this->blobs_[bias_param_id_] = bias_layer_->blobs()[0];
+    } else {
+      // bias param already initialized
+      bias_param_id_ = this->blobs_.size() - 1;
+      bias_layer_->blobs()[0] = this->blobs_[bias_param_id_];
+    }
     bias_propagate_down_.resize(1, false);
   }
   this->param_propagate_down_.resize(this->blobs_.size(), true);