change torch req for mps

README.md

@@ -170,7 +170,7 @@ A number of other libraries contain scripts for calling the eval harness through
 
 ### Additional Features
 
-If you have a CUDA-compatible Mac GPU, you can run the eval harness using the MPS back-end by replaicng `--device cuda:0` with `--device mps:0`. PyTorch does not currently support automatic mixed precision (AMP) for MPS, so we forcibly cast all weights to fp32 regardless of how they're stored. This is slower and has a larger memory footprint than we can achieve on Linux systems, but as PyTorch continues to improve its MPS support we hope to continue to improve it.
+If you have a Metal compatible Mac, you can run the eval harness using the MPS back-end by replacing `--device cuda:0` with `--device mps` (requires PyTorch version 2.1 or higher).
 
 💡 **Tip**: You can inspect what the LM inputs look like by running the following command:
 

lm_eval/api/model.py

@@ -133,13 +133,6 @@ class LM(abc.ABC):
         additional_config = {} if additional_config is None else additional_config
         args = utils.simple_parse_args_string(arg_string)
         args2 = {k: v for k, v in additional_config.items() if v is not None}
-        # TODO: delete once float16 MPS is fixed in torch stable
-        if (
-            args2.get("device") in ("mps", "mps:0")
-            or args.get("device") in ("mps", "mps:0")
-            and "dev" not in torch.__version__
-        ):
-            args["dtype"] = "float32"
         return cls(**args, **args2)
 
     @property

lm_eval/models/huggingface.py

 import os
-
+from packaging import version
 import torch
 import transformers
 from transformers.models.auto.modeling_auto import (
@@ -118,11 +118,11 @@ class HFLM(LM):
                     device = int(device)
                 self._device = torch.device(device)
                 eval_logger.info(f"Using device '{device}'")
-                if device in ("mps", "mps:0") and "dev" not in torch.__version__:
-                    eval_logger.info(
-                        "MPS: Setting dtype to float32. To use float16 with MPS, please install a nightly build of "
-                        "PyTorch: pip3 install --pre torch torchvision torchaudio --index-url "
-                        "https://download.pytorch.org/whl/nightly/cpu"
+                if device in ("mps", "mps:0") and version.parse(
+                    torch.__version__
+                ) < version.parse("2.1"):
+                    raise RuntimeError(
+                        f"mps requires torch >= 2.1. You have {torch.__version__}"
                     )
             else:
                 eval_logger.info("Device not specified")