Move PdbBreakpoint Op from tests to the theano package

doc/tutorial/debug_faq.txt

@@ -607,7 +607,7 @@ Breakpoint during Theano function execution
 -------------------------------------------
 
 You can set a breakpoint during the execution of a Theano function with
-:class:`PdbBreakpoint <tests.breakpoint.PdbBreakpoint>`.
-:class:`PdbBreakpoint <tests.breakpoint.PdbBreakpoint>` automatically
+:class:`PdbBreakpoint <theano.breakpoint.PdbBreakpoint>`.
+:class:`PdbBreakpoint <theano.breakpoint.PdbBreakpoint>` automatically
 detects available debuggers and uses the first available in the following order:
 `pudb`, `ipdb`, or `pdb`.

tests/gpuarray/test_opt.py

@@ -9,6 +9,7 @@ import theano.tensor.slinalg as slinalg
 from theano import tensor
 from theano.gof.opt import check_stack_trace
 from theano.tensor.nnet import abstract_conv
+from theano.breakpoint import PdbBreakpoint
 from theano.gpuarray import basic_ops
 from theano.gpuarray.type import GpuArrayType, gpuarray_shared_constructor, get_context
 from theano.gpuarray.basic_ops import (
@@ -34,7 +35,6 @@ from theano.gpuarray.linalg import GpuCusolverSolve, cusolver_available, GpuChol
 
 from tests import unittest_tools as utt, test_ifelse
 from tests.tensor import test_basic
-from tests.breakpoint import PdbBreakpoint
 from tests.gpuarray.config import mode_with_gpu, mode_without_gpu, test_ctx_name
 
 

tests/test_breakpoint.py

@@ -3,8 +3,9 @@ import numpy as np
 import theano
 import theano.tensor as T
 
+from theano.breakpoint import PdbBreakpoint
+
 from tests import unittest_tools as utt
-from tests.breakpoint import PdbBreakpoint
 
 
 class TestPdbBreakpoint(utt.InferShapeTester):

tests/breakpoint.py → theano/breakpoint.py

@@ -36,7 +36,7 @@ class PdbBreakpoint(Op):
 
         import theano
         import theano.tensor as T
-        from tests.breakpoint import PdbBreakpoint
+        from theano.breakpoint import PdbBreakpoint
 
         input = T.fvector()
         target = T.fvector()

theano/gpuarray/opt.py

@@ -51,7 +51,7 @@ import theano.tensor.signal.pool as pool
 import theano.tensor.slinalg as slinalg
 from collections import Counter
 
-from tests.breakpoint import PdbBreakpoint
+from theano.breakpoint import PdbBreakpoint
 
 from .type import (
     GpuArrayType,