Update pre-requirements.txt

pre-requirements.txt

@@ -1,6 +1,6 @@
-- python=3.8.5
-- pip=20.3
-- cudatoolkit=11.3
-- pytorch=1.11.0
-- torchvision=0.12.0
-- numpy=1.19.2
+python=3.8.5
+pip=20.3
+cudatoolkit=11.3
+pytorch=1.11.0
+torchvision=0.12.0
+numpy=1.19.2