据我所知，要在我的Ubuntu 14.04 PC上使用GPU，我必须安装像CUDA或Opencl这样的库。
inxi命令给出：
System: Host: xxxxxx Kernel: 4.4.0-31-generic x86_64 (64 bit) Desktop: Gnome Distro: Ubuntu 14.04 trusty
Machine: Mobo: Dell model: 0AM6R0 version: A00 Bios: Dell version: A00 date: 11/19/2014
CPU: Dual core Intel Core i7-5500U CPU (-HT-MCP-) clocked at 2481.750 MHz
Graphics: Card-1: Intel Broadwell-U Integrated Graphics
Card-2: Advanced Micro Devices [AMD/ATI] Opal XT [Radeon R7 M265]
X.Org: 1.18.3 drivers: ati,radeon,intel (unloaded: fbdev,vesa) Resolution: 1920x1080@60.0hz
GLX Renderer: Mesa DRI Intel HD Graphics 5500 (Broadwell GT2) GLX Version: 3.0 Mesa 11.2.0
Network: Card: Intel Wireless 3160 driver: iwlwifi
Drives: HDD Total Size: 1000.2GB (5.6% used)
Info: Processes: 315 Uptime: 2:09 Memory: 8697.8/15959.9MB Client: Shell (bash) inxi: 1.9.17
使用GPU需要做哪些步骤？我已经安装了CUDA（我猜它没有用，因为我有AMD卡）。
python解释器给出：
>>> print theano.config.device
cpu