Use MPS backend if available and use_device=None, add CHGNET_DEVICE env var
#131
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(prev would default to CPU in that case) also fix type errors
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E RuntimeError: MPS backend out of memory (MPS allocated: 0 bytes, other allocations: 0 bytes, max allowed: 7.93 GB). Tried to allocate 512 bytes on private pool. Use PYTORCH_MPS_HIGH_WATERMARK_RATIO=0.0 to disable upper limit for memory allocations (may cause system failure).
update deprecated ruff lint config
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janosh
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use_device is Noneuse_device=None, add CHGNET_DEVICE env var
janosh
changed the title
use_device=None, add CHGNET_DEVICE env varuse_device=None, add CHGNET_DEVICE env var
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prev would default to CPU in that case. we should default to the fastest hardware available on Mac.
this also ensures we test MPS backend in CI to catch breaking changes as in #130