supress warnings about inaccurate IIR filtering after 10 of them, war…

…n users about timestamp resolution.

fix warning about unrecognized extra arguments when there is no synthetic input function.

v2e.py

@@ -196,7 +196,7 @@ def main():
 
     # check to make sure there are no other arguments that might be bogus misspelled arguments in case
     # we don't have synthetic input class to pass these to
-    if synthetic_input_instance is None and not other_args is None:
+    if synthetic_input_instance is None and len(other_args)>0:
         logger.error(f'There is no synthetic input class specified but there are extra arguments {other_args} that are probably incorrect')
         v2e_quit(1)
 

v2ecore/emulator_utils.py

@@ -14,6 +14,7 @@
 logger = logging.getLogger(__name__)
 
 
+
 def lin_log(x, threshold=20):
     """
     linear mapping + logarithmic mapping.
@@ -84,7 +85,13 @@ def low_pass_filter(
         eps = inten01*(delta_time/tau)
         max_eps = torch.max(eps)
         if max_eps >0.3:
-            logger.warning(f'IIR lowpass filter update has large maximum update eps={max_eps:.2f} from delta_time/tau={delta_time:.3g}/{tau:.3g}')
+            IIR_MAX_WARNINGS = 10
+            if low_pass_filter.iir_warning_count<IIR_MAX_WARNINGS:
+                logger.warning(f'IIR lowpass filter update has large maximum update eps={max_eps:.2f} from delta_time/tau={delta_time:.3g}/{tau:.3g}')
+                low_pass_filter.iir_warning_count+=1
+                if low_pass_filter.iir_warning_count==IIR_MAX_WARNINGS:
+                    logger.warning(f'Supressing further warnings about inaccurate IIR lowpass filtering; check timestamp resolution and DVS photoreceptor cutoff frequency')
+
         eps = torch.clamp(eps, max=1)  # keep filter stable
     else:
         eps=delta_time/tau
@@ -101,6 +108,8 @@ def low_pass_filter(
 
     return new_lp_log_frame
 
+low_pass_filter.iir_warning_count=0
+
 
 def subtract_leak_current(base_log_frame,
                           leak_rate_hz,