fix: improve fbgemm_gpu check and lints

server/text_generation_server/layers/fp8.py

@@ -20,7 +20,10 @@ FBGEMM_DYN_AVAILABLE = False
 
 
 def is_fbgemm_gpu_available():
-    return importlib.util.find_spec("fbgemm_gpu.experimental.gen_ai") is not None
+    try:
+        return importlib.util.find_spec("fbgemm_gpu.experimental.gen_ai") is not None
+    except ModuleNotFoundError:
+        return False
 
 
 if is_fbgemm_gpu_available():

server/text_generation_server/layers/marlin/__init__.py

@@ -1,6 +1,3 @@
-from typing import List, Tuple
-
-import torch
 from text_generation_server.layers.marlin.fp8 import GPTQMarlinFP8Linear
 from text_generation_server.layers.marlin.gptq import (
     GPTQMarlinLinear,

server/text_generation_server/layers/marlin/marlin.py

@@ -1,5 +1,5 @@
 from dataclasses import dataclass
-from typing import List, Optional, Tuple, Union
+from typing import List, Optional, Union
 
 import torch
 import torch.nn as nn
@@ -85,7 +85,7 @@ class MarlinWeightsLoader(WeightsLoader):
                 )
             except RuntimeError:
                 raise RuntimeError(
-                    f"Cannot load `marlin` weight, make sure the model is already quantized"
+                    "Cannot load `marlin` weight, make sure the model is already quantized"
                 )
 
             B_meta = torch.cat(
@@ -104,7 +104,7 @@ class MarlinWeightsLoader(WeightsLoader):
                 )
             except RuntimeError:
                 raise RuntimeError(
-                    f"Cannot load `marlin` weight, make sure the model is already quantized"
+                    "Cannot load `marlin` weight, make sure the model is already quantized"
                 )
             s = torch.cat(
                 [weights.get_sharded(f"{p}.s", dim=1) for p in prefixes], dim=1