Extra FAQ bits

andyljones · Jul 19, 2020 · 8eb0217 · 8eb0217
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 FAQ
 ===
 
+How is megastep so fast?
+------------------------
+It cheats. It uses an extremely stripped down physics and rendering engine (most notably 1D observations) and it 
+simulates thousands of environments in parallel on the GPU. 
+
+How is megastep so flexible?
+----------------------------
+All the state is kept in `pytorch <https://pytorch.org/>`_ tensors, and only the compute-intensive physics and 
+rendering kernels are written in CUDA. Game logic is pretty fast compared to physics and rendering, so that
+can be done in Python with the ops provided by pytorch. Thanks, pytorch. 
+
 .. _inheritance:
 
 Why doesn't megastep use inheritance?