Support CUDA provider options. #36
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This PR adds the possibility to specify provider options in
load_inference.Of particular interest is the CUDA provider option
cudnn_conv_algo_search. The defaultEXHAUSTIVEoption is, although fastest, numerically somewhat unreliable. On newer GPUs it can cause Float32 convolution layers to produce results which vary with like 1000 eps between different sessions. For certain applications it's therefore valuable to be able to choose the (at least empirically) more stableDEFAULTandHEURISTICoptions.