Edenzzzz's fix for min_8bit_size functionality in Optimizer base classes (#1286)

* fix min_8bit_size invalid bug

* Apply same fix to other optimizer base class

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Co-authored-by: Edenzzzz <wtan45@wisc.edu>

bitsandbytes/optim/optimizer.py

@@ -437,7 +437,7 @@ class Optimizer2State(Optimizer8bit):
         state = self.state[p]
         state["step"] = 0
 
-        if dtype == torch.float32 or (dtype == torch.uint8 and p.numel() < 4096):
+        if dtype == torch.float32:
             state["state1"] = self.get_state_buffer(p, dtype=torch.float32)
             state["state2"] = self.get_state_buffer(p, dtype=torch.float32)
         elif dtype == torch.uint8:
@@ -656,7 +656,7 @@ class Optimizer1State(Optimizer8bit):
         state = self.state[p]
         state["step"] = 0
 
-        if dtype == torch.float32 or (dtype == torch.uint8 and p.numel() < 4096):
+        if dtype == torch.float32:
             state["state1"] = self.get_state_buffer(p, dtype=torch.float32)
         elif dtype == torch.uint8:
             if state["step"] == 0: