From 46c64c90d051fde7739979f62fcab094f56d0429 Mon Sep 17 00:00:00 2001
From: Petros Christodoulou <p.christodoulou2@gmail.com>
Date: Fri, 24 Jul 2020 22:22:41 +0100
Subject: [PATCH] fixed simplex initialisation seeding bug (#9660)

Co-authored-by: Petros Christodoulou <petrochr@amazon.com>
---
 rllib/utils/spaces/simplex.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/rllib/utils/spaces/simplex.py b/rllib/utils/spaces/simplex.py
index 94daed091..1e18f6aac 100644
--- a/rllib/utils/spaces/simplex.py
+++ b/rllib/utils/spaces/simplex.py
@@ -33,9 +33,10 @@ class Simplex(gym.Space):
             self.concentration = [1] * self.dim
 
         super().__init__(shape, dtype)
-        self.np_random = np.random.RandomState()
 
     def seed(self, seed=None):
+        if self.np_random is None:
+            self.np_random = np.random.RandomState()
         self.np_random.seed(seed)
 
     def sample(self):