def test_dnn_tag():
    """
    Test that if cudnn isn't avail we crash and that if it is avail, we use it.
    """
    x = T.ftensor4()
    old = theano.config.on_opt_error
    theano.config.on_opt_error = "raise"

    sio = StringIO()
    handler = logging.StreamHandler(sio)
    logging.getLogger('theano.compile.tests.test_dnn').addHandler(handler)
    # Silence original handler when intentionnally generating warning messages
    logging.getLogger('theano').removeHandler(theano.logging_default_handler)
    raised = False
    try:
        f = theano.function(
            [x],
            pool_2d(x, ds=(2, 2), ignore_border=True),
            mode=mode_with_gpu.including("cudnn"))
    except (__HOLE__, RuntimeError):
        assert not dnn.dnn_available(test_ctx_name)
        raised = True
    finally:
        theano.config.on_opt_error = old
        logging.getLogger(
            'theano.compile.tests.test_dnn').removeHandler(handler)
        logging.getLogger('theano').addHandler(theano.logging_default_handler)

    if not raised:
        assert dnn.dnn_available(test_ctx_name)
        assert any([isinstance(n.op, dnn.GpuDnnPool)
                    for n in f.maker.fgraph.toposort()])
dataset/ETHPy150Open rizar/attention-lvcsr/libs/Theano/theano/sandbox/gpuarray/tests/test_dnn.py/test_dnn_tag