remove import/variable not used (and add a missing warnings imports).

theano/compile/debugmode.py

@@ -756,7 +756,6 @@ def _check_viewmap(node, storage_map):
 
         good_alias, bad_alias = {}, {}
         outstorage = storage_map[onode][0]
-        instorage_id = [id(storage_map[i][0]) for i in node.inputs]
 
         # first find out which input it aliases
         view_map = getattr(node.op, 'view_map', {})
@@ -868,8 +867,6 @@ def _find_bad_optimizations0(order, reasons, r_vals):
     for i, node in enumerate(order):
         for new_r in node.outputs:
             for reason, r, old_graph_str, new_graph_str in reasons[new_r]:
-                problem = False
-
                 #check if the value for new_r doesn't match the value for r
                 new_r_val = r_vals[new_r]
                 r_val = r_vals[r]
@@ -1552,7 +1549,6 @@ class _Linker(gof.link.LocalLinker):
             # don't do this ugly hacky way of setting the
             # filter_checks_isfinite
             from theano.tensor import TensorType  # to set filter_check_isfinite
-            from theano import tests  # for config.unittests.rseed
         fgraph = self.fgraph
         input_storage_ = input_storage
         output_storage_ = output_storage
@@ -1706,8 +1702,6 @@ class _Linker(gof.link.LocalLinker):
                                          if r.owner is None]
 
             try:
-                equiv_vals = {}
-                problematic = set()
                 # r_vals are the true values associated with each
                 # variable in the graph they should not change during
                 # the evaluation of this function, even when the graph
@@ -2265,7 +2259,6 @@ class _Maker(FunctionMaker):  # inheritance buys a few helper functions
                                     "default for a SymbolicInputKit.")
                 input_storage.append(default.storage)
                 default = None
-                required = False
             elif isinstance(input, SymbolicInputKit):
                 # If the input is a SymbolicInputKit, it represents more than
                 # one storage unit. The indices and subinputs lists represent

theano/sandbox/cuda/basic_ops.py

@@ -9,6 +9,7 @@ import theano
 from theano import gof, Type, Apply
 from theano import tensor, scalar, config
 from theano.compat.six import StringIO
+from theano.gradient import grad_undefined
 from theano.scalar import Scalar
 
 scal = scalar # somewhere scalar gets reassigned to be a function

theano/sandbox/cuda/elemwise.py

@@ -7,15 +7,15 @@ that ndim is 0 as with all scalar type.
 """
 
 
-import copy, logging, sys
+import logging
 
 import numpy
 
 from theano.scalar.basic import upgrade_to_float_no_complex, complex_types
 from theano.scalar.basic_scipy import Erfinv
 from theano.compat.six import StringIO
-from theano import Apply, Constant, Op, Type, Variable
-from theano import gof, scalar, tensor
+from theano import Apply
+from theano import gof, scalar
 
 
 _logger_name = 'theano.sandbox.cuda.elemwise'
@@ -430,7 +430,6 @@ class NaiveAlgo(object):
         return sio.getvalue()
 
     def c_src_kernel_Ccontiguous(self, node, nodename):
-        nd = node.outputs[0].type.ndim
         sio = StringIO()
         #print 'C_SRC_KERNEL', sio.getvalue()
 

theano/sandbox/cuda/nvcc_compiler.py

-import commands
 import distutils
 import logging
 import os
-import re
 import subprocess
 import sys
 import warnings
@@ -245,7 +243,6 @@ class NVCC_compiler(object):
             preargs = list(preargs)
         if sys.platform != 'win32':
             preargs.append('-fPIC')
-        no_opt = False
         cuda_root = config.cuda.root
 
         #The include dirs gived by the user should have precedence over

theano/scan_module/scan_perform_ext.py

@@ -2,6 +2,7 @@ import errno
 import logging
 import os
 import sys
+import warnings
 
 import numpy