added comments to floatx

theano/floatx.py

+"""Provide xscalar, xvector, xmatrix, etc. pseudo-types 
+"""
 import theano.config as config
 from theano.scalar import float32, float64
-from theano.tensor import fscalar, fvector, fmatrix, frow, fcol, ftensor3, ftensor4, dscalar, dvector, dmatrix, drow, dcol, dtensor3, dtensor4
+from theano.tensor import (fscalar, fvector, fmatrix, frow, fcol, ftensor3, ftensor4, dscalar,
+        dvector, dmatrix, drow, dcol, dtensor3, dtensor4)
+
+#
+# !!! set_floatX adds symbols directly to the module's symbol table !!!
+#
 
 def set_floatX(dtype = config.floatX):
   """ add the xmatrix, xvector, xscalar etc. aliases to theano.tensor
@@ -14,7 +21,6 @@ def set_floatX(dtype = config.floatX):
   globals()['floatX'] = globals()[dtype]
 #  convert_to_floatX = Cast(floatX, name='convert_to_floatX')
 
-
   #tensor.tensor stuff
   for symbol in ('scalar', 'vector', 'matrix', 'row', 'col','tensor3','tensor4'):
      globals()['x'+symbol] = globals()[prefix+symbol]