replaced float64 with config.floatX

doc/library/tensor/basic.txt

@@ -601,7 +601,7 @@ dimensions, see :meth:`_tensor_py_operators.dimshuffle`
 
     Create a matrix by filling the shape of `a` with `b`
 
-.. function:: eye(n, m = None, k = 0, dtype='float64')
+.. function:: eye(n, m = None, k = 0, dtype=theano.config.floatX)
 
     :param n: number of rows in output (value or theano scalar)
     :param m: number of columns in output (value or theano scalar)

theano/tensor/basic.py

@@ -1703,7 +1703,7 @@ def zeros_like(model):
     return fill(model, constant(0.0, dtype=model.type.dtype))
 
 class Eye(gof.Op):
-    def __init__(self, dtype='float64'):
+    def __init__(self, dtype=config.floatX):
         self.dtype = dtype
     def make_node(self,n,m,k):
         n = as_tensor_variable(n)
@@ -1724,7 +1724,7 @@ class Eye(gof.Op):
         return hash(self.dtype) ^ hash(type(self))
 
 
-def eye(n, m=None, k = 0, dtype = 'float64'):
+def eye(n, m=None, k = 0, dtype = config.floatX):
     if m == None:
         m = n
     localop = Eye(dtype)