Lua 加载模块时出错 'libpng'（Torch、MacOSX）

Question

如何在 Lua 中正确加载 libpng？我在运行ning Lua/Torch in Mac OSX 10.10.3 的 iTorch Notebook 中， Lua 中的其他基本功能在这里工作，例如绘图和计算。

 brew install libpng

Warning: libpng-1.6.17 already installed

如果我运行:

require 'nn';
require 'image';
itorch.image(image.lena())

error loading module 'libpng' from file '/usr/local/lib/lua/5.1/libpng.so': dlopen(/usr/local/lib/lua/5.1/libpng.so, 6): Library not loaded: /usr/local/lib/libpng15.15.dylib Referenced from: /usr/local/lib/lua/5.1/libpng.so Reason: Incompatible library version: libpng.so requires version 33.0.0 or later, but libpng15.15.dylib provides version 29.0.0 warning: could not be loaded (is it installed?) /usr/local/share/lua/5.1/dok/inline.lua:736: libpng package not found, please install libpng stack traceback: [C]: in function 'error' /usr/local/share/lua/5.1/dok/inline.lua:736: in function 'error' /usr/local/share/lua/5.1/image/init.lua:142: in function 'saver' /usr/local/share/lua/5.1/image/init.lua:355: in function 'save' /Users/MY/torch/install/share/lua/5.1/itorch/gfx.lua:25: in function 'f' [string "local f = function() return itorch.image(iii)..."]:1: in main chunk [C]: in function 'xpcall' /Users/MY/torch/install/share/lua/5.1/itorch/main.lua:177: in function /Users/MY/torch/install/share/lua/5.1/lzmq/poller.lua:75: in function 'poll' /Users/MY/torch/install/share/lua/5.1/lzmq/impl/loop.lua:307: in function 'poll' /Users/MY/torch/install/share/lua/5.1/lzmq/impl/loop.lua:325: in function 'sleep_ex' /Users/MY/torch/install/share/lua/5.1/lzmq/impl/loop.lua:370: in function 'start' /Users/MY/torch/install/share/lua/5.1/itorch/main.lua:344: in main chunk [C]: in function 'require' [string "arg={'/Users/MY/.ipython/profile_default/secu..."]:1: in main chunk

Answer 1

重新安装图像包以及强制链接 libpng 可能会解决它：

brew link libpng --force
luarocks install image

Answer 2

我遇到了类似的问题 (OSX 10.9.5)。您可能安装了多个版本的 libpng，在安装 luarocks 期间调用的版本具有 i386 架构（需要x86_64）。

解决这个问题：

再次尝试安装映像，并阅读日志：

luarocks 安装镜像
检查日志以查看是否收到以下类型的消息：

ld：警告：忽略文件 /Library/Frameworks//libpng.framework/libpng，在文件 /Library/Frameworks//libpng.framework/libpng 中缺少必需的体系结构 x86_64 (2 片)
如果是这种情况（假设使用 brew）删除 /Library/Frameworks 中的 libpng 框架并执行

brew 安装 libpng --universal
重新安装映像和运行。

这对我有用，希望对你也有用。

Lua 加载模块时出错 'libpng'（Torch、MacOSX）

Lua error loading module 'libpng' (Torch, MacOSX)

macos

lua

libpng

osx-yosemite

torch