Add AdEMAMix optimizer #1360
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Add AdEMAMix optimizer #1360
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matthewdouglas
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Sep 16, 2024
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| # For parity with bnb implementation we combine both fast | ||
| # and slow EMA stats into one stacked tensor. | ||
| state["m1_m2"] = p.new_zeros((2, *p.size())) |
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This is done for ease of compatibility with the existing test suite. In most other implementations we'll see two separate buffers here.
matthewdouglas
commented
Sep 16, 2024
| // AdEMAMix has an additional state buffer, which we packed | ||
| // into state1. We need thread-local storage here for these. | ||
| // TODO: Mark with [[maybe_unused]] after upgrade to min compiler. | ||
| float s3_vals[NUM_PER_THREAD]; |
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There's a few extra memory allocations like this to support AdEMAMix. Have not confirmed if the compiler is optimizing these out for instantiations with OPTIMIZER=ADAM, but if not, the overhead isn't very much.
TimDettmers
previously approved these changes
Sep 20, 2024
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The docs for this PR live here. All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update. |
matthewdouglas
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Oct 28, 2024
* Add AdEMAMix optimizer * Add PagedAdEMAMix32bit, AdEMAMix32bit * Add PagedAdEMAMix32bit, AdEMAMix32bit * AdEMAMix: add support for alpha/beta3 scheduling * Update paged AdEMAMix
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Adds support for the AdEMAMix optimizer described here: https://arxiv.org/abs/2409.03137
Includes blockwise 8bit and 32bit versions, each supporting paged operation.
AdEMAMix is a modification to Adam which introduces an additional EMA component. It is observed that AdEMAMix can forget training data at a slower pace and can reach similar loss as AdamW with significantly less training data.
TODO: Implement scheduler for alpha/beta3