Models · Classification

AlexNet

AlexNet (Krizhevsky et al. 2012): five convolutions and three fully connected layers; an early deep convolutional classifier.

Commercial use: yes.

variantinputbackendtime (ms)peak memory (MiB, allocated / reserved)
alexnet.tv_in1ksynthetic (224x224)original (fp32)
original
portable
kernels
portable + torch.compile
TensorRT fp16		1.17
1.82
0.970
0.604
0.824
0.401		271 / 284
383 / 404
151 / 224
184 / 228
183 / 204
128 (engine)
Details
  • Original code: https://github.com/pytorch/vision at 1f1a920d685d
  • Code licence: BSD-3-Clause (permissive); files:
  • Weights licence: BSD-3-Clause (assumed from code)
  • Licence evidence: https://github.com/pytorch/vision/blob/1f1a920d685d46dfbe187934b785b7ecb7a182f2/LICENSE
  • Training data: ImageNet-1k (ILSVRC 2012 classification)
  • Kernel libraries: cudnn_hacc, fvm_conv, fvm_extra, fvm_mb, fvm_r3
  • Variants: alexnet.tv_in1k (default of alexnet)
  • Outputs: logits; label_set: imagenet-1k
  • Input size: fixed 224x224: the input is resized (short side 256) and centre-cropped to it
  • Tested up to (portable, fp16, RTX 5060 Ti 16 GB): alexnet.tv_in1k 224x224 (0.1 GiB peak allocated, 0.3 reserved)
  • alexnet.tv_in1k 224x224, first call: portable + torch.compile 4 s (cold Inductor cache), TensorRT fp16 13 s (ONNX + engine).
  • alexnet.tv_in1k original 224x224: torch.autocast(fp16) around the forward
  • alexnet.tv_in1k load / first call: original 2.51 s / 0.811 s, portable 1.3 s / 0.016 s, kernels 1.4 s / 0.055 s
  • Protocol, median of 9 after 3 warm-up, uint8 CUDA input (synthetic for bench_inputs sizes), card defaults; gc before each load; peak = max over the first call and the timed calls

Measured

fastforks: the model's own resize / crop on the GPU; original: the library's pretrained loader and its PIL eval transform. Original = the original code named under Details, same checkpoint and protocol.

variantdatasetoriginal fp32original fp16portablekernelsnote
alexnet.tv_in1kImageNet-1k val, 5000 random images, top-1 / top-5 %57.72 / 80.5457.66 / 80.5457.80 / 80.5057.82 / 80.42

Measured on NVIDIA GeForce RTX 5060 Ti, torch 2.14.1+cu130, fastforks 939adfe8, 2026-11-06.

Parity

CPU, float32: max |diff| <= 0.002 vs the original. GPU, float16 (the default), portable and kernels: mean |diff| <= 0.02 and p99 <= 0.08 (absolute error of the output logits).

variantkernels error vs original, mean / p99GPU, torchkernels used
alexnet.tv_in1k0.00407 / 0.01472RTX 5060 Ti, torch 2.14.1+cu130cudnn_hacc@cudnn92400, fvm_conv@f1d064e539e1:sm_120, fvm_extra@3208ce525a91:sm_120, fvm_mb@720dd3f29bf7:sm_120, fvm_r3@f54eb890e23c:sm_120