Handle MPS with for export and generate+compile (#716)

* Handle compile for export and generate

* typo

* typo

* typo

Author: mikekgfb

Diff for: README.md

@@ -216,7 +216,7 @@ For more details on quantization and what settings to use for your use
 case visit our [Quanitization documentation](docs/quantization.md) or
 run `python3 torchchat.py export`
 
-[end default]:
+[end default]: end
 
 ### Deploy and run on iOS
 

Diff for: cli.py

@@ -330,6 +330,14 @@ def arg_init(args):
             args.quantize.get("executor", {}).get("accelerator", args.device)
         )
 
+    if "mps" in args.device:
+        if args.compile or args.compile_prefill:
+            print(
+                "Warning: compilation is not available with device MPS, ignoring option to engage compilation"
+            )
+            args.compile = False
+            args.compile_prefill = False
+
     if hasattr(args, "seed") and args.seed:
         torch.manual_seed(args.seed)
     return args

Diff for: export.py

@@ -48,6 +48,10 @@ def main(args):
     output_pte_path = args.output_pte_path
     output_dso_path = args.output_dso_path
 
+    if output_dso_path and "mps" in builder_args.device:
+        print("Warning! Device MPS not supported for export. Exporting for device CPU.")
+        builder_args.device = "cpu"
+        
     # TODO: clean this up
     # This mess is because ET does not support _weight_int4pack_mm right now
     if not builder_args.gguf_path:
@@ -85,7 +89,6 @@ def main(args):
     with torch.no_grad():
         if output_pte_path:
             output_pte_path = str(os.path.abspath(output_pte_path))
-            print(f">{output_pte_path}<")
             if executorch_export_available:
                 print(f"Exporting model using ExecuTorch to {output_pte_path}")
                 export_model_et(