> In my experience NVidia benchmark numbers in deep learning are rarely lies - they are highly optimised, in optimal conditions and rarely achievable in the real world.
Right, but Nvidia claimed 1360 images/sec for resnet-50 on imagenet. To my knowledge this still hasn’t been realized by a third party. It also isn’t a 4x improvement for fp32 vs fp16, that’s comparing to previous generation. Improvement is more like 1.5x: https://lambdalabs.com/blog/best-gpu-tensorflow-2080-ti-vs-v...
Even in very simple synthetic benchmarks the speed up is only 2x: https://github.com/tensorflow/benchmarks/issues/77#issuecomm...
I have not seen any benchmarks showing an 8x speedup. Have you? If not -> Nvidia lied.
On https://images.nvidia.com/content/technologies/volta/pdf/vol... they claim 1,525 images/sec (!)
Dell hit 5,243 images/sec with one of their 4 V100s servers, which comes to 1,310 images/sec per V100. I find it very believable that NVidia would get ~200 images/sec more, since Dell jumped 50% with a change in their CPU/GPU connection topology.
See https://www.dell.com/support/article/en-au/sln317397/deep-le...
The thing I've seen is very limited (NVIDIA GPUs offer up to 8x more half precision arithmetic throughput when compared to single-precision, thus speeding up math-limited layers.[1]) which is probably true.
The problem with performance improvements is the diminishing returns part of Amdahl Law: an 8x improvement in math performance will just mean the math part becomes less important in terms of absolute performance.
In any case, I've found NVidia's claims in the machine learning area to be pretty good. Like most claims you have to read carefully to see exactly what the claim is, but that's not uncommon with performance claims.
[1] https://docs.nvidia.com/deeplearning/performance/mixed-preci...
[2] https://en.wikipedia.org/wiki/Amdahl%27s_law#Relation_to_the...
Right but I’ve benchmarked the best case scenario, ie a large GEMM call in C++, and still not seen anywhere close to 8x. I’ve never seen a code example, no matter how limited, showing a 8x speed up.
See cuBLAS mixed-precision GEMM.
The performance numbers posted here appear to almost exactly reflect the LambdaLabs numbers.
Lambda Labs: the RTX 2080 Ti is 96% as fast as Titan V, 73% as fast as Tesla V100 (32 GB)
timdettmers: RTX 2080 Ti normalized to 1, Titan V looks about 1.1 to 1.2, V100 is just below 1.5
> for example, see this thread from right after Nvidia announced an 8x improvement in speed on imagenet in tensorflow for V100
Well a non-NVidia person managed to get it up to just above 4x improvement without "using unreleased libraries from NVIDIA". From the same thread: https://github.com/tensorflow/benchmarks/issues/77#issuecomm...
In my experience NVidia benchmark numbers in deep learning are rarely lies - they are highly optimised, in optimal conditions and rarely achievable in the real world. About what you'd expect from a vendor benchmark.