Add string description for Rebroadcast.

Dimensions where the broadcastable flag is added are marked denoted by '1', dimensions where it is removed are displayed as '0', the ones left unchanged are marked by '?'. This list is implicitly extended to the right by as many '?' as needed.

Add string description for Rebroadcast.
be600f45 · Pascal Lamblin · 090b9a0f · be600f45
--- a/theano/tensor/basic.py
+++ b/theano/tensor/basic.py
@@ -2574,6 +2574,11 @@ class Rebroadcast(Op):
    view_map = {0: [0]}
    def __init__(self, *axis):
        self.axis = dict(axis)
+    def __str__(self):
+        broadcast_pattern = ['?' for i in range(1+numpy.max(self.axis.keys()))]
+        for k,v in self.axis.iteritems():
+            broadcast_pattern[k] = str(int(v))
+        return '%s{%s}' % (self.__class__.__name__, ','.join(broadcast_pattern))
    def make_node(self, x):
        t = x.type.__class__(dtype = x.type.dtype,
                       broadcastable = [self.axis.get(i, b)