google
Failed to resolve name "x" used by "test"
def test():
x = []
for i in range(5):
x.append(i)
return x
In [10]: xxx = tangent.grad(test)
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
<ipython-input-10-e1ef2738f728> in <module>()
----> 1 xxx = tangent.grad(test)
/shared/sdoerr/Software/miniconda3/lib/python3.6/site-packages/tangent/grad_util.py in grad(func, wrt, optimized, preserve_result, check_dims, verbose)
384 check_dims=check_dims,
385 input_derivative=INPUT_DERIVATIVE.DefaultOne,
--> 386 verbose=verbose)
387
388
/shared/sdoerr/Software/miniconda3/lib/python3.6/site-packages/tangent/grad_util.py in autodiff(func, wrt, optimized, motion, mode, preserve_result, check_dims, input_derivative, verbose)
288 # Generate the derivative
289 node, namespace = autodiff_tree(func, wrt, motion, mode, preserve_result,
--> 290 check_dims, verbose)
291
292 if mode == 'reverse' and motion == 'joint':
/shared/sdoerr/Software/miniconda3/lib/python3.6/site-packages/tangent/grad_util.py in autodiff_tree(func, wrt, motion, mode, preserve_result, check_dims, verbose)
142
143 node, required = autodiff_ast(func, wrt, motion, mode, preserve_result,
--> 144 check_dims, verbose)
145 final.body.extend(node.body)
146
/shared/sdoerr/Software/miniconda3/lib/python3.6/site-packages/tangent/grad_util.py in autodiff_ast(func, wrt, motion, mode, preserve_result, check_dims, verbose)
87 for the returned function to run.
88 """
---> 89 node = annotate.resolve_calls(func)
90 fence.validate(node, inspect.getsource(func))
91 node = anf_.anf(node)
/shared/sdoerr/Software/miniconda3/lib/python3.6/site-packages/tangent/annotate.py in resolve_calls(func)
108 """
109 node = quoting.parse_function(func)
--> 110 ResolveCalls(func).visit(node)
111 return node
112
/shared/sdoerr/Software/miniconda3/lib/python3.6/ast.py in visit(self, node)
251 method = 'visit_' + node.__class__.__name__
252 visitor = getattr(self, method, self.generic_visit)
--> 253 return visitor(node)
254
255 def generic_visit(self, node):
/shared/sdoerr/Software/miniconda3/lib/python3.6/ast.py in generic_visit(self, node)
259 for item in value:
260 if isinstance(item, AST):
--> 261 self.visit(item)
262 elif isinstance(value, AST):
263 self.visit(value)
/shared/sdoerr/Software/miniconda3/lib/python3.6/ast.py in visit(self, node)
251 method = 'visit_' + node.__class__.__name__
252 visitor = getattr(self, method, self.generic_visit)
--> 253 return visitor(node)
254
255 def generic_visit(self, node):
/shared/sdoerr/Software/miniconda3/lib/python3.6/site-packages/tangent/annotate.py in visit_FunctionDef(self, node)
43
44 def visit_FunctionDef(self, node):
---> 45 self.generic_visit(node)
46 anno.setanno(node, 'func', self.func)
47
/shared/sdoerr/Software/miniconda3/lib/python3.6/ast.py in generic_visit(self, node)
259 for item in value:
260 if isinstance(item, AST):
--> 261 self.visit(item)
262 elif isinstance(value, AST):
263 self.visit(value)
/shared/sdoerr/Software/miniconda3/lib/python3.6/ast.py in visit(self, node)
251 method = 'visit_' + node.__class__.__name__
252 visitor = getattr(self, method, self.generic_visit)
--> 253 return visitor(node)
254
255 def generic_visit(self, node):
/shared/sdoerr/Software/miniconda3/lib/python3.6/ast.py in generic_visit(self, node)
259 for item in value:
260 if isinstance(item, AST):
--> 261 self.visit(item)
262 elif isinstance(value, AST):
263 self.visit(value)
/shared/sdoerr/Software/miniconda3/lib/python3.6/ast.py in visit(self, node)
251 method = 'visit_' + node.__class__.__name__
252 visitor = getattr(self, method, self.generic_visit)
--> 253 return visitor(node)
254
255 def generic_visit(self, node):
/shared/sdoerr/Software/miniconda3/lib/python3.6/ast.py in generic_visit(self, node)
261 self.visit(item)
262 elif isinstance(value, AST):
--> 263 self.visit(value)
264
265
/shared/sdoerr/Software/miniconda3/lib/python3.6/ast.py in visit(self, node)
251 method = 'visit_' + node.__class__.__name__
252 visitor = getattr(self, method, self.generic_visit)
--> 253 return visitor(node)
254
255 def generic_visit(self, node):
/shared/sdoerr/Software/miniconda3/lib/python3.6/site-packages/tangent/annotate.py in visit_Call(self, node)
64 node.id, self.func.__name__))
65
---> 66 func = resolve(node.func)
67 # If the user has used the @tangent.trace decorator,
68 # then we'll switch to tracing the function.
/shared/sdoerr/Software/miniconda3/lib/python3.6/site-packages/tangent/annotate.py in resolve(node)
51 def resolve(node):
52 if isinstance(node, gast.Attribute):
---> 53 return getattr(resolve(node.value), node.attr)
54 if isinstance(node, gast.Name):
55 if node.id in self.namespace:
/shared/sdoerr/Software/miniconda3/lib/python3.6/site-packages/tangent/annotate.py in resolve(node)
62 raise AttributeError(
63 'Failed to resolve name "%s" used by "%s".'% (
---> 64 node.id, self.func.__name__))
65
66 func = resolve(node.func)
AttributeError: Failed to resolve name "x" used by "test".
Hi Stefan, this is a case where we should provide a better error message, but the function test has no gradient, since it has no arguments.
On Fri, Feb 23, 2018 at 5:07 AM Stefan Doerr [email protected] wrote:
def test(): x = [] for i in range(5): x.append(i) return x
In [10]: xxx = tangent.grad(test)
AttributeError Traceback (most recent call last)
in () ----> 1 xxx = tangent.grad(test) /shared/sdoerr/Software/miniconda3/lib/python3.6/site-packages/tangent/grad_util.py in grad(func, wrt, optimized, preserve_result, check_dims, verbose) 384 check_dims=check_dims, 385 input_derivative=INPUT_DERIVATIVE.DefaultOne, --> 386 verbose=verbose) 387 388
/shared/sdoerr/Software/miniconda3/lib/python3.6/site-packages/tangent/grad_util.py in autodiff(func, wrt, optimized, motion, mode, preserve_result, check_dims, input_derivative, verbose) 288 # Generate the derivative 289 node, namespace = autodiff_tree(func, wrt, motion, mode, preserve_result, --> 290 check_dims, verbose) 291 292 if mode == 'reverse' and motion == 'joint':
/shared/sdoerr/Software/miniconda3/lib/python3.6/site-packages/tangent/grad_util.py in autodiff_tree(func, wrt, motion, mode, preserve_result, check_dims, verbose) 142 143 node, required = autodiff_ast(func, wrt, motion, mode, preserve_result, --> 144 check_dims, verbose) 145 final.body.extend(node.body) 146
/shared/sdoerr/Software/miniconda3/lib/python3.6/site-packages/tangent/grad_util.py in autodiff_ast(func, wrt, motion, mode, preserve_result, check_dims, verbose) 87 for the returned function to run. 88 """ ---> 89 node = annotate.resolve_calls(func) 90 fence.validate(node, inspect.getsource(func)) 91 node = anf_.anf(node)
/shared/sdoerr/Software/miniconda3/lib/python3.6/site-packages/tangent/annotate.py in resolve_calls(func) 108 """ 109 node = quoting.parse_function(func) --> 110 ResolveCalls(func).visit(node) 111 return node 112
/shared/sdoerr/Software/miniconda3/lib/python3.6/ast.py in visit(self, node) 251 method = 'visit_' + node.class.name 252 visitor = getattr(self, method, self.generic_visit) --> 253 return visitor(node) 254 255 def generic_visit(self, node):
/shared/sdoerr/Software/miniconda3/lib/python3.6/ast.py in generic_visit(self, node) 259 for item in value: 260 if isinstance(item, AST): --> 261 self.visit(item) 262 elif isinstance(value, AST): 263 self.visit(value)
/shared/sdoerr/Software/miniconda3/lib/python3.6/ast.py in visit(self, node) 251 method = 'visit_' + node.class.name 252 visitor = getattr(self, method, self.generic_visit) --> 253 return visitor(node) 254 255 def generic_visit(self, node):
/shared/sdoerr/Software/miniconda3/lib/python3.6/site-packages/tangent/annotate.py in visit_FunctionDef(self, node) 43 44 def visit_FunctionDef(self, node): ---> 45 self.generic_visit(node) 46 anno.setanno(node, 'func', self.func) 47
/shared/sdoerr/Software/miniconda3/lib/python3.6/ast.py in generic_visit(self, node) 259 for item in value: 260 if isinstance(item, AST): --> 261 self.visit(item) 262 elif isinstance(value, AST): 263 self.visit(value)
/shared/sdoerr/Software/miniconda3/lib/python3.6/ast.py in visit(self, node) 251 method = 'visit_' + node.class.name 252 visitor = getattr(self, method, self.generic_visit) --> 253 return visitor(node) 254 255 def generic_visit(self, node):
/shared/sdoerr/Software/miniconda3/lib/python3.6/ast.py in generic_visit(self, node) 259 for item in value: 260 if isinstance(item, AST): --> 261 self.visit(item) 262 elif isinstance(value, AST): 263 self.visit(value)
/shared/sdoerr/Software/miniconda3/lib/python3.6/ast.py in visit(self, node) 251 method = 'visit_' + node.class.name 252 visitor = getattr(self, method, self.generic_visit) --> 253 return visitor(node) 254 255 def generic_visit(self, node):
/shared/sdoerr/Software/miniconda3/lib/python3.6/ast.py in generic_visit(self, node) 261 self.visit(item) 262 elif isinstance(value, AST): --> 263 self.visit(value) 264 265
/shared/sdoerr/Software/miniconda3/lib/python3.6/ast.py in visit(self, node) 251 method = 'visit_' + node.class.name 252 visitor = getattr(self, method, self.generic_visit) --> 253 return visitor(node) 254 255 def generic_visit(self, node):
/shared/sdoerr/Software/miniconda3/lib/python3.6/site-packages/tangent/annotate.py in visit_Call(self, node) 64 node.id, self.func.name)) 65 ---> 66 func = resolve(node.func) 67 # If the user has used the @tangent.trace decorator, 68 # then we'll switch to tracing the function.
/shared/sdoerr/Software/miniconda3/lib/python3.6/site-packages/tangent/annotate.py in resolve(node) 51 def resolve(node): 52 if isinstance(node, gast.Attribute): ---> 53 return getattr(resolve(node.value), node.attr) 54 if isinstance(node, gast.Name): 55 if node.id in self.namespace:
/shared/sdoerr/Software/miniconda3/lib/python3.6/site-packages/tangent/annotate.py in resolve(node) 62 raise AttributeError( 63 'Failed to resolve name "%s" used by "%s".'% ( ---> 64 node.id, self.func.name)) 65 66 func = resolve(node.func) AttributeError: Failed to resolve name "x" used by "test".
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