From f7d5a265e173224ec184851a77180ad26e763465 Mon Sep 17 00:00:00 2001
From: Andy Twigg <andy.twigg@gmail.com>
Date: Fri, 31 May 2019 14:26:45 -0700
Subject: [PATCH] suppress excessive messages from unused loggers (#920)

Only print the "logging to [dir]" message when the logger has something to output. Running with the new spawn change and both mpi and subprocvecenv, there are many "logging to [dir]" messages but most are not logging anything.
---
 baselines/logger.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/baselines/logger.py b/baselines/logger.py
index 36b0c98..77d40ba 100644
--- a/baselines/logger.py
+++ b/baselines/logger.py
@@ -394,7 +394,8 @@ def configure(dir=None, format_strs=None, comm=None, log_suffix=''):
     output_formats = [make_output_format(f, dir, log_suffix) for f in format_strs]
 
     Logger.CURRENT = Logger(dir=dir, output_formats=output_formats, comm=comm)
-    log('Logging to %s'%dir)
+    if output_formats:
+        log('Logging to %s'%dir)
 
 def _configure_default_logger():
     configure()