如何在Ipython Notebook上使用我的GPU？

操作系统:Ubuntu 14.04LTS
语言:Python Anaconda 2.7(keras,theano)
GPU:GTX980Ti CUDA:CUDA 7.5

我想通过使用我的GPU(GTX980Ti)在IPython Notebook上运行keras python代码
但是我找不到它.

我想测试下面的代码.当我把它运行到Ubuntu终端时,我命令如下(它使用GPU很好.它没有任何问题)

首先,我设置如下的路径

export PATH=/usr/local/cuda/bin:$PATH
export LD_LIBRARY_PATH=/usr/local/cuda/lib64:$LD_LIBRARY_PATH 

其次,我运行如下代码

THEANO_FLAGS='floatX=float32,device=gpu0,nvcc.fastmath=True'  python myscript.py

它运行良好.

但是当我在pycharm(python IDE)上运行代码或者当我在Ipython Notebook上运行它时,它不使用gpu.它只使用CPU

myscript.py代码如下.

from theano import function, config, shared, sandbox
import theano.tensor as T
import numpy
import time
vlen = 10 * 30 * 768  # 10 x #cores x # threads per core
iters = 1000
rng = numpy.random.RandomState(22)
x = shared(numpy.asarray(rng.rand(vlen), config.floatX))
f = function([], T.exp(x))
print(f.maker.fgraph.toposort())
t0 = time.time()
for i in xrange(iters):
    r = f()
t1 = time.time()
print("Looping %d times took %f seconds" % (iters, t1 - t0))
print("Result is %s" % (r,))
if numpy.any([isinstance(x.op, T.Elemwise) for x in f.maker.fgraph.toposort()]):
    print('Used the cpu')
else:
    print('Used the gpu')

要解决它,我强制代码使用gpu如下 (在myscript.py上多插入两行)

import theano.sandbox.cuda
theano.sandbox.cuda.use("gpu0")

然后它会产生如下错误

ERROR (theano.sandbox.cuda): nvcc compiler not found on $PATH. Check your nvcc installation and try again.

怎么做？？？我花了两天时间.
我肯定在主目录中使用'.theanorc'文件.