Traceback (most recent call last):



 "/shared/sdoerr/Software/miniconda3/lib/python3.6/site-packages/IPython/core/interactiveshell.py", line 2862, in run_code

exec(code_obj, self.user_global_ns, self.user_ns)



 "<ipython-input-27-0194034bf20a>", line 1, in <module>

grad = tangent.grad(featurize3, preserve_result=True)



 "/shared/sdoerr/Software/miniconda3/lib/python3.6/site-packages/tangent/grad_util.py", line 178, in grad

node, namespace = grad_tree(func, wrt, motion, mode, preserve_result, verbose)



 "/shared/sdoerr/Software/miniconda3/lib/python3.6/site-packages/tangent/grad_util.py", line 111, in grad_tree

mode, True, verbose)



 "/shared/sdoerr/Software/miniconda3/lib/python3.6/site-packages/tangent/grad_util.py", line 48, in grad_ast

fence.validate(node, inspect.getsource(func))



 "/shared/sdoerr/Software/miniconda3/lib/python3.6/site-packages/tangent/fence.py", line 34, in validate

lf.visit(node)



 "/shared/sdoerr/Software/miniconda3/lib/python3.6/ast.py", line 253, in visit

return visitor(node)



 "/shared/sdoerr/Software/miniconda3/lib/python3.6/site-packages/tangent/fence.py", line 95, in visit_Module

self._allow_and_continue(node)



 "/shared/sdoerr/Software/miniconda3/lib/python3.6/site-packages/tangent/fence.py", line 87, in _allow_and_continue

self.generic_visit(node)



 "/shared/sdoerr/Software/miniconda3/lib/python3.6/ast.py", line 261, in generic_visit

self.visit(item)



 "/shared/sdoerr/Software/miniconda3/lib/python3.6/ast.py", line 253, in visit

return visitor(node)



 "/shared/sdoerr/Software/miniconda3/lib/python3.6/site-packages/tangent/fence.py", line 364, in visit_FunctionDef

self._allow_and_continue(node)



 "/shared/sdoerr/Software/miniconda3/lib/python3.6/site-packages/tangent/fence.py", line 87, in _allow_and_continue

self.generic_visit(node)



 "/shared/sdoerr/Software/miniconda3/lib/python3.6/ast.py", line 261, in generic_visit

self.visit(item)



 "/shared/sdoerr/Software/miniconda3/lib/python3.6/ast.py", line 253, in visit

return visitor(node)



 "/shared/sdoerr/Software/miniconda3/lib/python3.6/site-packages/tangent/fence.py", line 377, in visit_Return

self._allow_and_continue(node)



 "/shared/sdoerr/Software/miniconda3/lib/python3.6/site-packages/tangent/fence.py", line 87, in _allow_and_continue

self.generic_visit(node)



 "/shared/sdoerr/Software/miniconda3/lib/python3.6/ast.py", line 263, in generic_visit

self.visit(value)



 "/shared/sdoerr/Software/miniconda3/lib/python3.6/ast.py", line 253, in visit

return visitor(node)



 "/shared/sdoerr/Software/miniconda3/lib/python3.6/site-packages/tangent/fence.py", line 250, in visit_Call

self._allow_and_continue(node)



 "/shared/sdoerr/Software/miniconda3/lib/python3.6/site-packages/tangent/fence.py", line 87, in _allow_and_continue

self.generic_visit(node)



 "/shared/sdoerr/Software/miniconda3/lib/python3.6/ast.py", line 261, in generic_visit

self.visit(item)



 "/shared/sdoerr/Software/miniconda3/lib/python3.6/ast.py", line 253, in visit

return visitor(node)



 "/shared/sdoerr/Software/miniconda3/lib/python3.6/site-packages/tangent/fence.py", line 144, in visit_Starred

self._reject(node, 'Unpackings are not supported')



 "/shared/sdoerr/Software/miniconda3/lib/python3.6/site-packages/tangent/fence.py", line 91, in _reject

self._raise_error(msg)



 "/shared/sdoerr/Software/miniconda3/lib/python3.6/site-packages/tangent/fence.py", line 74, in _raise_error

raise TangentParseError(msg, ('<stdin>', lineno, offset + 1, line))



 "<stdin>", line 4

return f_raw(*argvals, **kwargs)

^
TangentParseError: Unpackings are not supported

Traceback (most recent call last):


 "<string>", line 1, in <module>
ModuleNotFoundError: No module named 'chess'
