removed automatic casts, and changed mean to cast input to FP, and added print op

theano/printing.py

-
+"""Pretty-printing graphs, and the 'Print' Op.
+"""
 import gof
 from copy import copy
 import sys
 
+from gof import Op, Apply
+
+class Print(Op):
+    """This identity-like Op has the side effect of printing a message followed by its inputs
+    when it runs.
+    """
+    def __init__(self,message=""):
+        self.message=message
+        self.view_map={0:[0]}
+
+    def make_node(self,xin):
+        xout = xin.type.make_result()
+        return Apply(op = self, inputs = [xin], outputs=[xout])
+
+    def perform(self,node,inputs,output_storage):
+        xin, = inputs
+        xout, = output_storage
+        xout[0] = xin
+        print self.message,xin
+
+    def grad(self,input,output_gradients):
+        return output_gradients
 
 class PrinterState(gof.utils.scratchpad):
     
@@ -232,3 +255,4 @@ pprint.assign(lambda pstate, r: hasattr(pstate, 'target') and pstate.target is n
 
 pp = pprint
 
+

theano/tensor/basic.py

@@ -21,7 +21,7 @@ from .. import scalar as scal
 from ..gof.python25 import partial
 
 from .. import compile, printing
-from ..printing import pprint
+from ..printing import pprint, Print
 
 
 ### set up the external interface
@@ -456,10 +456,11 @@ class _tensor_py_operators:
     def __abs__(self): return abs_(self)
     def __neg__(self): return neg(self)
 
-    #CASTS
-    def __int__(self): return AsInt(self).out
-    def __float__(self): return AsInt(self).out
-    def __complex__(self): return AsComplex(self).out
+    #CASTS 
+    #### REMOVED THESE BECAUSE PYTHON appears to require __int__ to return an int. -JB 20081112
+    #def __int__(self): return convert_to_int32(self)
+    #def __float__(self): return convert_to_float64(self)
+    #def __complex__(self): return convert_to_complex128(self)
 
     #COMPARISONS
     def __lt__(self,other): return lt(self, other)
@@ -1012,6 +1013,10 @@ pprint.assign(Sum(), printing.FunctionPrinter('sum'))
 @constructor
 def mean(input, axis = None):
     """WRITEME"""
+    if str(input.dtype).startswith('int'):
+        # we need to cast eventually anyway, and this helps
+        # to prevents overflow
+        input = convert_to_float64(input)
     s = sum(input, axis)
     shp = shape(input)
     if axis is None: