fix wrong check, remove type conversion

include/caffe/filler.hpp

@@ -247,18 +247,19 @@ class LinearFiller : public Filler<Dtype> {
   explicit LinearFiller(const FillerParameter& param)
       : Filler<Dtype>(param) {}
   virtual void Fill(Blob<Dtype>* blob) {
-    CHECK_GT(blob->num_axes(), 3) << "Blob must have at least 3 dimensions.";
+    CHECK_GE(blob->num_axes(), 3) << "Blob must have at least 3 dimensions.";
     Dtype* data = blob->mutable_cpu_data();
     for (int i = 0; i < blob->count(); ++i) {
       unsigned int stride = 1;
       Dtype weight = 1;
       for (int axis = 0; axis < blob->num_axes() - 2; ++axis) {
         unsigned int shape = blob->shape(axis + 2);
-        unsigned int sampling_factor = std::ceil(shape / 2.0f);
-        float center = (2 * sampling_factor - 1 - sampling_factor % 2)
-            / (2.0f * sampling_factor);
-        float coordinate = (i / stride) % shape;
-        weight *= 1 - std::abs(coordinate / sampling_factor - center);
+        unsigned int factor = std::ceil(shape / 2.0f);
+        Dtype center = (2 * factor - 1 - factor % 2)
+            / static_cast<Dtype>(2 * factor);
+        Dtype coordinate = ((i / stride) % shape)
+            / static_cast<Dtype>(factor);
+        weight *= 1 - std::abs(coordinate - center);
         stride *= shape;
       }
       data[i] = weight;