Allow mixing positiv and negativ axis.

theano/tensor/basic.py

@@ -2653,7 +2653,10 @@ class MaxAndArgmax(Op):
             axis = [axis]
         elif isinstance(axis, (tuple, list)):
             if len(axis) != 1:
-                list(axis)
+                axis = list(axis)
+                for idx in range(len(axis)):
+                    if axis[idx] < 0:
+                        axis[idx] += x.type.ndim
                 axis.sort()
                 if axis == range(-x.type.ndim, 0, 1):
                     axis = range(x.type.ndim)

theano/tensor/tests/test_keepdims.py

@@ -36,7 +36,8 @@ class TestKeepDims:
         # 'max_and_argmax' has two outputs and can be specified with either
         # a single or every axis:
         for axis in [0, 1, 2, [0], [1], [2], None, [0, 1, 2],
-                     [-1], [-2], [-3]]:
+                     [-1], [-2], [-3], [-1, -2, -3], [0, -1, -2],
+                     [-2, -3, 2]]:
 
             op = tensor.max_and_argmax
             keep_param = function([x], op(x, axis=axis, keepdims=True)[0])
@@ -57,7 +58,7 @@ class TestKeepDims:
         # axis:
         for op in ([tensor.argmax, tensor.argmin]):
             for axis in [0, 1, 2, [0], [1], [2], None, [0, 1, 2],
-                         [-1], [-2], [-3], [-1, -2, -3]]:
+                         [-1], [-2], [-3], [-1, -2, -3], [0, -2, 2]]:
 
                 keep_param = function([x], op(x, axis=axis, keepdims=True))
                 keep_synth = function([x], self.makeKeepDims_local(x,
@@ -79,7 +80,7 @@ class TestKeepDims:
                     tensor.std, tensor.all, tensor.any,
                     tensor.max, tensor.min]):
             for axis in [0, 1, 2, [0], [1], [2], [0, 1], [1, 2], [0, 1, 2],
-                         [-1], [-2], [-3], [-1, -2], [-1, -2, -3]]:
+                         [-1], [-2], [-3], [-1, -2], [-1, -2, -3], [0, -2, 2]]:
 
                 keep_param = function([x], op(x, axis=axis, keepdims=True))
                 keep_synth = function([x], self.makeKeepDims_local(x,