pytorch

8a5b946f - [caffe2] Don't call TensorImpl::size() in dim32() (#53852)

[caffe2] Don't call TensorImpl::size() in dim32() (#53852) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/53852 dim32() requires that its argument is in range, so we can use the faster `TensorImpl::sizes()` call instead. ghstack-source-id: 123784862 Test Plan: Ran MergeNet AdIndexer benchmark under perf stat. Before: ``` Performance counter stats for 'scripts/bwasti/static_runtime/run.sh' (5 runs): 7,008.70 msec task-clock # 0.997 CPUs utilized ( +- 0.25% ) 4,203 context-switches # 0.600 K/sec ( +- 14.71% ) 3 cpu-migrations # 0.000 K/sec 93,896 page-faults # 0.013 M/sec ( +- 0.80% ) 13,869,719,763 cycles # 1.979 GHz ( +- 0.23% ) (50.05%) 27,561,765,867 instructions # 1.99 insn per cycle ( +- 0.06% ) (50.04%) 4,288,245,412 branches # 611.846 M/sec ( +- 0.05% ) (50.01%) 19,633,433 branch-misses # 0.46% of all branches ( +- 0.83% ) (50.01%) # Table of individual measurements: 7.0670 (+0.0379) # 6.9897 (-0.0394) # 7.0203 (-0.0088) # 6.9829 (-0.0462) # 7.0856 (+0.0565) # # Final result: 7.0291 +- 0.0205 seconds time elapsed ( +- 0.29% ) ``` After: ``` Performance counter stats for 'scripts/bwasti/static_runtime/run.sh' (5 runs): 6,935.61 msec task-clock # 0.997 CPUs utilized ( +- 0.47% ) 2,913 context-switches # 0.420 K/sec ( +- 15.25% ) 3 cpu-migrations # 0.000 K/sec 92,628 page-faults # 0.013 M/sec ( +- 0.50% ) 13,724,940,495 cycles # 1.979 GHz ( +- 0.47% ) (50.01%) 27,226,217,974 instructions # 1.98 insn per cycle ( +- 0.02% ) (50.03%) 4,220,129,358 branches # 608.472 M/sec ( +- 0.06% ) (50.04%) 19,025,346 branch-misses # 0.45% of all branches ( +- 0.53% ) (50.04%) # Table of individual measurements: 6.9402 (-0.0145) # 6.8570 (-0.0978) # 6.9311 (-0.0236) # 7.0101 (+0.0554) # 7.0352 (+0.0805) # # Final result: 6.9547 +- 0.0315 seconds time elapsed ( +- 0.45% ) ``` Roughly 1% cycles win, which is outside the quoted noise level. Reviewed By: hlu1 Differential Revision: D26994107 fbshipit-source-id: f4c4963be0a5c268cbcdac5359f8278750218ae6