rng_mrg - use numpy.seterr to suppress overflow warnings

theano/sandbox/rng_mrg.py

@@ -31,11 +31,15 @@ def mulmod(a, b, c, m):
 
 def matVecModM(A, s, m):
     # return (A * s) % m
+    err_orig = numpy.seterr(over='ignore')
+    try:
         x = numpy.zeros_like(s)
         for i in xrange(len(x)):
             for j in xrange(len(s)):
                 x[i] = mulmod(A[i][j], s[j], x[i], m)
         return x
+    finally:
+        numpy.seterr(**err_orig)
 
 def multMatVect(v, A, m1, B, m2):
     #multiply the first half of v by A with a modulo of m1
@@ -81,6 +85,8 @@ def ff_2p72(rstate):
     return multMatVect(rstate, A1p72, M1, A2p72, M2)
 
 def mrg_next_value(rstate, new_rstate):
+    err_orig = numpy.seterr(over='ignore')
+    try:
         x11, x12, x13, x21, x22, x23 = rstate
         assert type(x11) == numpy.int32
 
@@ -129,6 +135,8 @@ def mrg_next_value(rstate, new_rstate):
             return (x11 - x21 + M1) * NORM
         else:
             return (x11 - x21) * NORM
+    finally:
+        numpy.seterr(**err_orig)
 
 class mrg_uniform_base(Op):
     def __init__(self, output_type, inplace=False):