fix

mhcflurry/parallelism.py

@@ -221,7 +221,7 @@ def worker_init_entry_point(
 def worker_init(keras_backend=None, gpu_device_nums=None, worker_log_dir=None):
     if worker_log_dir:
         sys.stderr = sys.stdout = open(
-            os.path.join(worker_log_dir, "LOG-worker.%d.txt", "w"))
+            os.path.join(worker_log_dir, "LOG-worker.%d.txt" % os.getpid(), "w"))
 
     # Each worker needs distinct random numbers
     numpy.random.seed()