Resolve "release v1.2.0"

Closes #257 (closed)

mlair/data_handler/default_data_handler.py

@@ -256,6 +256,7 @@ class DefaultDataHandler(AbstractDataHandler):
         if multiprocessing.cpu_count() > 1:  # parallel solution
             logging.info("use parallel transformation approach")
             pool = multiprocessing.Pool()
+            logging.info(f"running {getattr(pool, '_processes')} processes in parallel")
             output = [
                 pool.apply_async(f_proc, args=(cls.data_handler_transformation, station), kwds=sp_keys)
                 for station in set_stations]