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cudnn-fp16 gives "illegal memory access" in v0.31-rc1 -- worked fine on v0.30 #2007

@mooskagh

Description

@mooskagh

Originally posted by @fsmosca in #2000 (comment)

What is wrong?

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Found pb network file: F:\Chess\Engines\Lc0\lc0-v0.31.0-rc1-windows-gpu-nvidia-cudnn/791556.pb.gz
Creating backend [cudnn-auto]...
Switching to [cudnn-fp16]...
CUDA Runtime version: 10.0.0
Cudnn version: 7.4.2
Latest version of CUDA supported by the driver: 12.2.0
GPU: NVIDIA GeForce GTX 1650 SUPER
GPU memory: 3.99957 GiB
GPU clock frequency: 1770 MHz
GPU compute capability: 7.5
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position startpos
go movetime 60000
Unhandled exception in worker thread: CUDA error: an illegal memory access was encountered (c:\projects\lc0\src\neural\cuda\network_cudnn.cc:865)

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