Added Error Logging

BackendBench/backends/llm.py

@@ -16,6 +16,7 @@
 
 import torch
 
+from BackendBench.errors import AgentError
 from BackendBench.eval import (
     CorrectnessTestResult,
     eval_performance,
@@ -306,10 +307,14 @@ def test_kernel_correctness(
         feedback_info.kernel_code = kernel_code
 
         try:
+            # Only raise AgentError if kernel_code is missing or malformed
+            if not kernel_code or not isinstance(kernel_code, str):
+                raise AgentError(
+                    "Kernel code is empty or not a string (agent failed to produce a kernel)."
+                )
             kernel_file = self._generate_kernel_file_path(op_name, attempt)
             if not os.path.exists(kernel_file):
                 save_kernel_to_file(kernel_code, kernel_file)
-
             spec = importlib.util.spec_from_file_location(
                 f"{op_name}_implementation_v{attempt}", kernel_file
             )
@@ -320,10 +325,8 @@ def test_kernel_correctness(
 
             try:
                 spec.loader.exec_module(module)
-
                 expected_name = f"{op_name}_kernel_impl"
                 if hasattr(module, expected_name):
-                    # check if the kernel compile / is loadable
                     _ = getattr(module, expected_name)
                 else:
                     available_functions = [
@@ -334,12 +337,9 @@ def test_kernel_correctness(
                     raise ValueError(
                         f"Expected function '{expected_name}' not found. Available: {available_functions}"
                     )
-
             finally:
                 if f"test_kernel_{op_name}_{attempt}" in sys.modules:
                     del sys.modules[f"test_kernel_{op_name}_{attempt}"]
-
-                # Clear CUDA cache and synchronize to prevent memory buildup
                 if torch.cuda.is_available():
                     torch.cuda.empty_cache()
                     torch.cuda.synchronize()
@@ -353,10 +353,7 @@ def test_kernel_correctness(
                     test_cases,
                     [],
                 )
-
-                # Start evaluation
                 evaluator.start_evaluation()
-                # Get results
                 results = evaluator.get_results()
 
             for result in results:
@@ -370,6 +367,10 @@ def test_kernel_correctness(
 
             return is_correct, feedback_info
 
+        except AgentError as e:
+            feedback_info.compilation_error = str(e)
+            feedback_info.summary = f"Agent error: {str(e)}"
+            return False, feedback_info
         except Exception as e:
             logger.error("    ✗ Compilation failed:")
             logger.error(f"      Error: {str(e)}")

BackendBench/errors.py

@@ -0,0 +1,16 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the BSD 3-Clause license found in the
+# LICENSE file in the root directory of this source tree.
+
+
+class AgentError(Exception):
+    """
+    Exception raised for errors related to LLM/agent failures,
+    such as rate limits, empty code, bad formatting, or API issues.
+    """
+
+    def __init__(self, message: str):
+        super().__init__(message)
+        self.message = message

BackendBench/llm_client.py

@@ -9,9 +9,12 @@
 
 import anthropic
 import requests
+from requests.exceptions import ConnectionError
 from tenacity import retry
 from tenacity.wait import wait_random_exponential
 
+from BackendBench.errors import AgentError
+
 from .kernel_templates import KernelTemplateManager
 
 
@@ -60,15 +63,26 @@ def readme_setup_section(self) -> str:
 
     @retry(wait=wait_random_exponential(multiplier=2, min=1, max=60, exp_base=2))
     def call_llm(self, prompt: str) -> str:
-        response = self.client.messages.create(
-            model=self.model,
-            max_tokens=8000,
-            temperature=0.2,
-            timeout=120.0,
-            messages=[{"role": "user", "content": prompt}],
-        )
-        content = response.content[0].text
-        return content
+        try:
+            response = self.client.messages.create(
+                model=self.model,
+                max_tokens=8000,
+                temperature=0.2,
+                timeout=120.0,
+                messages=[{"role": "user", "content": prompt}],
+            )
+            content = response.content[0].text
+            if not content:
+                raise ConnectionError(
+                    "API error: Empty response from LLM API (possible rate limit or outage)."
+                )
+            if "rate limit" in content.lower():
+                raise ConnectionError("API error: Rate limit encountered from LLM API.")
+            return content
+        except anthropic.AnthropicError as e:
+            raise ConnectionError(f"API error: Anthropic API error: {e}")
+        except Exception as e:
+            raise ConnectionError(f"API error: Unexpected error: {e}")
 
     def generate_kernel(
         self,
@@ -93,9 +107,7 @@ def generate_kernel(
 
         try:
             content = self.call_llm(prompt)
-            if not content:
-                raise RuntimeError("Empty response from LLM relay server")
-
+            # Only raise AgentError if kernel extraction fails
             extracted_code = self._extract_code_from_response(content)
 
             print("\n=== DEBUG: RAW LLM RELAY RESPONSE ===")
@@ -106,25 +118,18 @@ def generate_kernel(
 
             return extracted_code
 
-        except requests.exceptions.RequestException as e:
-            raise RuntimeError(
-                f"Failed to communicate with LLM relay server for {op_name}: {str(e)}"
-            )
+        except AgentError:
+            raise
         except Exception as e:
-            raise RuntimeError(f"Failed to generate kernel for {op_name}: {str(e)}")
+            raise AgentError(f"Agent error: Failed to generate kernel for {op_name}: {str(e)}")
 
     def _extract_code_from_response(self, response: str) -> str:
         if "```python" not in response:
-            raise ValueError(
-                "No Python code block found in LLM response. Response should contain ```python...``` block."
-            )
-
+            raise AgentError("Agent error: No Python code block found in LLM response.")
         start = response.find("```python") + len("```python")
         end = response.find("```", start)
-
         if end == -1:
-            raise ValueError("Unclosed Python code block in LLM response.")
-
+            raise AgentError("Agent error: Unclosed Python code block in LLM response.")
         return response[start:end].strip()
 
 
@@ -180,17 +185,24 @@ def call_llm(self, prompt: str) -> str:
             else None
         )
 
-        response = requests.post(
-            self.server_url,
-            json=request_data,
-            headers={"Content-Type": "application/json"},
-            timeout=120.0,
-            proxies=proxies,
-        )
-
-        if response.status_code != 200:
-            raise RuntimeError(f"Server returned status {response.status_code}: {response.text}")
-
-        response_data = response.json()
-        content = response_data.get("output", "")
-        return content
+        try:
+            response = requests.post(
+                self.server_url,
+                json=request_data,
+                headers={"Content-Type": "application/json"},
+                timeout=120.0,
+                proxies=proxies,
+            )
+            if response.status_code != 200:
+                raise ConnectionError(
+                    f"Server returned status {response.status_code}: {response.text}"
+                )
+            response_data = response.json()
+            content = response_data.get("output", "")
+            if not content or "rate limit" in content.lower():
+                raise ConnectionError("Empty response or rate limit encountered.")
+            return content
+        except requests.exceptions.RequestException as e:
+            raise AgentError(f"Agent error: Failed to communicate with LLM relay server: {str(e)}")
+        except Exception as e:
+            raise AgentError(f"Agent error: Unexpected error in LLM relay call: {e}")