train.cpp: error: reference to 'end' is ambiguous error message appears when compile. Please take a look at the screenshot. Environment: Mac Apple LLVM version 8.1.0 (clang-802.0.42) <img width="600" alt="screen shot 2018-02-19 at 20 03 16" src="https://user-images.githubusercontent.com/32857916/36377102-b9a0d08e-15b0-11e8-911f-454759753938.png">
train.cpp: error: reference to 'end' is ambiguous
error message appears when compile. Please take a look at the screenshot.
Environment: Mac
Apple LLVM version 8.1.0 (clang-802.0.42)