fix: replace bare except clauses with except Exception

Bare `except:` catches BaseException including KeyboardInterrupt and
SystemExit. Replaced 5 instances with `except Exception:`.

nanochat/dataset.py

@@ -95,7 +95,7 @@ def download_single_file(index):
                 if os.path.exists(path):
                     try:
                         os.remove(path)
-                    except:
+                    except Exception:
                         pass
             # Try a few times with exponential backoff: 2^attempt seconds
             if attempt < max_attempts:

nanochat/report.py

@@ -22,7 +22,7 @@ def run_command(cmd):
         if result.returncode == 0:
             return ""
         return None
-    except:
+    except Exception:
         return None
 
 def get_git_info():
@@ -237,7 +237,7 @@ def extract_timestamp(content, prefix):
             time_str = line.split(":", 1)[1].strip()
             try:
                 return datetime.datetime.strptime(time_str, "%Y-%m-%d %H:%M:%S")
-            except:
+            except Exception:
                 pass
     return None
 

scripts/base_train.py

@@ -559,7 +559,7 @@ while True:
     if first_step_of_run:
         gc.collect() # manually collect a lot of garbage from setup
         gc.freeze() # immediately freeze all currently surviving objects and exclude them from GC
-        gc.disable() # nuclear intervention here: disable GC entirely except:
+        gc.disable() # nuclear intervention here: disable GC entirely except Exception:
     elif step % 5000 == 0: # every 5000 steps...
         gc.collect() # manually collect, just to be safe for very, very long runs
 

scripts/chat_sft.py

@@ -468,7 +468,7 @@ while True:
     if step == 1:
         gc.collect() # manually collect a lot of garbage from setup
         gc.freeze() # freeze all currently surviving objects and exclude them from GC
-        gc.disable() # disable GC entirely except:
+        gc.disable() # disable GC entirely except Exception:
     elif step % 5000 == 0: # every 5000 steps...
         gc.collect() # manually collect, just to be safe for very long runs