Merge pull request #740 from karpathy/gordicaleksa-fix_dataloader2 #1615

Job	Run time
build-cuda-bf16	1m 34s
build-and-test-cpu (ubuntu-latest)	10m 16s
build-cuda-fp16	1m 29s
build-cuda-fp32	1m 27s
build-and-test-cpu (macos-latest)	6m 58s
build-cuda-kernels	1m 53s
build-and-test-cpu (windows-latest)	8m 31s
build-cuda-windows	2m 38s
build-ubuntu20-04	3m 2s
	37m 48s

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