add mpi_run version (not working yet)

examples/pybullet/gym/pybullet_envs/deep_mimic/mpi_run.py

@@ -0,0 +1,23 @@
+import sys
+import subprocess
+from pybullet_utils.arg_parser import ArgParser
+from pybullet_utils.logger import Logger
+
+def main():
+    # Command line arguments
+    args = sys.argv[1:]
+    arg_parser = ArgParser()
+    arg_parser.load_args(args)
+
+    num_workers = arg_parser.parse_int('num_workers', 1)
+    assert(num_workers > 0)
+
+    Logger.print2('Running with {:d} workers'.format(num_workers))
+    cmd = 'mpiexec -n {:d} python3 DeepMimic_Optimizer.py '.format(num_workers)
+    cmd += ' '.join(args)
+    Logger.print2('cmd: ' + cmd)
+    subprocess.call(cmd, shell=True)
+    return
+
+if __name__ == '__main__':
+    main()