Error when compiling using cmake: contrastive_loss_layer.cpp: error: no matching function for call to 'max(float, double)'

[aliko70]

I am trying to compile your version of Caffe and miserably have faced this issue that I don't seem to be able to solve it. I appreciate hints from anyone.
Here's what I do:

1. Installed all dependencies
2. Changed Make.config file to use only cpu with python layer = 1
3. cmake --cmake -DCPU_ONLY=ON .. (And bellow is cmake configuration summary):

-- ******************* Caffe Configuration Summary *******************
-- General:
-- Version : (Caffe doesn't declare its version in headers)
-- Git : 1595004-dirty
-- System : Linux
-- C++ compiler : /usr/bin/c++
-- Release CXX flags : -O3 -DNDEBUG -fPIC -Wall -Wno-sign-compare -Wno-uninitialized
-- Debug CXX flags : -g -fPIC -Wall -Wno-sign-compare -Wno-uninitialized
-- Build type : Release

-- BUILD_SHARED_LIBS : ON
-- BUILD_python : ON
-- BUILD_matlab : OFF
-- BUILD_docs : ON
-- CPU_ONLY : ON

-- Dependencies:
-- BLAS : Yes (Atlas)
-- Boost : Yes (ver. 1.62)
-- glog : Yes
-- gflags : Yes
-- protobuf : Yes (ver. 3.0.0)
-- lmdb : Yes (ver. 0.9.18)
-- Snappy : Yes (ver. 1.1.3)
-- LevelDB : Yes (ver. 1.18)
-- OpenCV : Yes (ver. 2.4.9.1)
-- CUDA : No

-- Python:
-- Interpreter : /usr/bin/python2.7 (ver. 2.7.13)
-- Libraries : /usr/lib/x86_64-linux-gnu/libpython2.7.so (ver 2.7.13)
-- NumPy : /usr/lib/python2.7/dist-packages/numpy/core/include (ver 1.12.1)

-- Documentaion:
-- Doxygen : No
-- config_file :

-- Install:
-- Install path : /data/CTPN/caffe/build/install

-- Configuring done
-- Generating done
-- Build files have been written to: /data/CTPN/caffe/build

4. make all -j4 (results in the following error):

[ 14%] Building CXX object src/caffe/CMakeFiles/caffe.dir/layers/contrastive_loss_layer.cpp.o
[ 14%] Building CXX object src/caffe/CMakeFiles/caffe.dir/layers/conv_layer.cpp.o
/home/CTPN/caffe/src/caffe/layers/contrastive_loss_layer.cpp: In instantiation of 'void caffe::ContrastiveLossLayer::Forward_cpu(const std::vector<caffe::Blob>&, const std::vector<caffe::Blob>&) [with Dtype = float]':
/home/CTPN/caffe/src/caffe/layers/contrastive_loss_layer.cpp:118:1: required from here
/home/CTPN/caffe/src/caffe/layers/contrastive_loss_layer.cpp:56:30: error: no matching function for call to 'max(float, double)'
Dtype dist = std::max(margin - sqrt(dist_sq_.cpu_data()[i]), 0.0);
~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

I have managed and used original version of caffe. Although I faced all types of error during its compilation, except this one.

Many thanks in advance.

[aliko70]

The issue was with gcc and g++ versions. I downgraded them from version 6 to 5 and that solved the problem

[fwang18]

Hi, I have encountered same question, but downgrade gcc doesn't solve the problem. Can you be more specific?

[Yannick-ll]

Hi fwang18,
Replace line 56 by this one :
Dtype dist = std::max(margin - (float)sqrt(dist_sq_.cpu_data()[i]), Dtype(0.0));

Casting output of 'sqrt' function solved the problem for me.

[JeasonUESTC]

Hello, I have encountered the same problem in the learning process. How did you solve it?Thank you.

[Viliami]

In my case, casting to double worked for me.
Dtype dist = std::max(margin - (double)sqrt(dist_sq_.cpu_data()[i]), Dtype(0.0));

[zhuqiming678]

    Dtype dist = std::max<Dtype>(margin - sqrt(dist_sq_.cpu_data()[i]), Dtype(0.0));

[zhuqiming678]

    Dtype dist = std::max<Dtype>(margin - sqrt(dist_sq_.cpu_data()[i]), Dtype(0.0));