Simplify operation implementation: remove mode switching, always use global counter

Co-authored-by: ProExpertProg <11367180+ProExpertProg@users.noreply.github.com>

tests/compile/piecewise/test_simple.py

@@ -17,12 +17,9 @@ from vllm.forward_context import BatchDescriptor, set_forward_context
 
 # Import shared test operations  
 from tests.compile.test_operations import (
-    get_global_counter, reset_global_counter, enable_counting_mode
+    get_global_counter, reset_global_counter
 )
 
-# Enable counting mode for this test's specific behavior
-enable_counting_mode()
-
 
 @support_torch_compile
 class SillyModel(nn.Module):
@@ -36,9 +33,8 @@ class SillyModel(nn.Module):
 
     def forward(self, x: torch.Tensor) -> torch.Tensor:
         """
-        Overall effect:
-        x += 1
-        x[0] += 2
+        Overall effect with unified attention implementation:
+        input [0., 0.] -> final output [19., 19.]
         global_counter += 2
         """
         x = x + 1
@@ -107,4 +103,4 @@ def test_simple_piecewise_compile(use_inductor):
                 batch_descriptor=BatchDescriptor(num_tokens=2, )):
             output = model(input)
         assert get_global_counter() == 2
-        assert torch.allclose(output.cpu(), torch.tensor([3., 1.]))
+        assert torch.allclose(output.cpu(), torch.tensor([19., 19.]))

tests/compile/test_operations.py

@@ -9,7 +9,7 @@ duplicate operation registrations that would cause RuntimeErrors when
 running tests together.
 
 The main "attention" operation is automatically registered when this module
-is imported. Individual test files can access additional functionality
+is imported. Individual test files can access the global counter functionality
 through helper functions.
 """
 
@@ -23,53 +23,34 @@ from vllm.utils import direct_register_custom_op
 silly_lib = Library("silly", "FRAGMENT")
 
 
-# Global state for test_simple.py compatibility
+# Global counter that all tests can use or ignore
 _global_counter = 0
-_use_counting_mode = False
 
 
 def get_global_counter():
-    """Get the current global counter value (for test_simple.py)"""
+    """Get the current global counter value"""
     return _global_counter
 
 
 def reset_global_counter():
-    """Reset the global counter to 0 (for test_simple.py)"""
+    """Reset the global counter to 0"""
     global _global_counter
     _global_counter = 0
 
 
-def enable_counting_mode():
-    """Enable counting mode for test_simple.py"""
-    global _use_counting_mode
-    _use_counting_mode = True
-    reset_global_counter()
-
-
-def disable_counting_mode():
-    """Disable counting mode"""
-    global _use_counting_mode
-    _use_counting_mode = False
-
-
 def silly_attention(q: torch.Tensor, k: torch.Tensor, v: torch.Tensor,
                    out: torch.Tensor) -> None:
     """
-    Unified attention implementation that can handle both standard and counting modes.
+    Unified attention implementation that depends on all inputs and affects the output.
+    Always increments a global counter that tests can use or ignore.
     """
-    global _global_counter, _use_counting_mode
+    global _global_counter
     
-    if _use_counting_mode:
-        # Counting mode for test_simple.py
-        _global_counter += 1
-        print(f"global_counter={_global_counter}")
-        out.copy_(q)
-        out[0] += 1
-    else:
-        # Standard mode for test_multiple_graphs.py and test_toy_llama.py
-        out.copy_(q)
-        out += k
-        out += v
+    # Always increment the global counter
+    _global_counter += 1
+    
+    # Unified implementation that depends on all inputs
+    out.copy_(q + k + v)
 
 
 def silly_attention_fake(q: torch.Tensor, k: torch.Tensor, v: torch.Tensor,