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taichi-dev / difftaichi

10 differentiable physical simulators built with Taichi differentiable programming (DiffTaichi, ICLR 2020)
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taichi.lang.kernel.KernelDefError: No more for loops allowed #22

Closed BooPatienze closed 4 years ago

BooPatienze commented 4 years ago

When I run billiards.py, I got this error but I don't kown how to deal with it.

[Taichi] mode=release [Taichi] version 0.5.7, cpu only, commit 568f6651, python 3.7.3 Traceback (most recent call last): File "D:\workspace\Python\difftaichi-master\examples\billiards.py", line 215, in optimize() File "D:\workspace\Python\difftaichi-master\examples\billiards.py", line 172, in optimize forward(visualize=True, output=output) File "F:\Python\Anaconda3\lib\site-packages\taichi\lang\tape.py", line 19, in exit self.grad() File "F:\Python\Anaconda3\lib\site-packages\taichi\lang\tape.py", line 28, in grad func.grad(*args) File "F:\Python\Anaconda3\lib\site-packages\taichi\lang\kernel.py", line 399, in call self.materialize(key=key, args=args, arg_features=arg_features) File "F:\Python\Anaconda3\lib\site-packages\taichi\lang\kernel.py", line 247, in materialize KernelSimplicityASTChecker(self.func).visit(tree) File "F:\Python\Anaconda3\lib\ast.py", line 262, in visit return visitor(node) File "F:\Python\Anaconda3\lib\site-packages\taichi\lang\ast_checker.py", line 66, in generic_visit super().generic_visit(node) File "F:\Python\Anaconda3\lib\ast.py", line 270, in generic_visit self.visit(item) File "F:\Python\Anaconda3\lib\ast.py", line 262, in visit return visitor(node) File "F:\Python\Anaconda3\lib\site-packages\taichi\lang\ast_checker.py", line 66, in generic_visit super().generic_visit(node) File "F:\Python\Anaconda3\lib\ast.py", line 270, in generic_visit self.visit(item) File "F:\Python\Anaconda3\lib\ast.py", line 262, in visit return visitor(node) File "F:\Python\Anaconda3\lib\site-packages\taichi\lang\ast_checker.py", line 99, in visit_For super().generic_visit(node) File "F:\Python\Anaconda3\lib\ast.py", line 270, in generic_visit self.visit(item) File "F:\Python\Anaconda3\lib\ast.py", line 262, in visit return visitor(node) File "F:\Python\Anaconda3\lib\site-packages\taichi\lang\ast_checker.py", line 96, in visit_For f'No more for loops allowed, at {self.get_error_location(node)}') taichi.lang.kernel.KernelDefError: No more for loops allowed, at file=D:\workspace\Python\difftaichi-master\examples\billiards.py kernel=collide line=78

What's wrong with it? Hope someone can help me. Thanks very much!

yuanming-hu commented 4 years ago

Sorry about the issue and my delayed reply. I believe it's fixed in the latest commit.