remove the EQ opt in a EQ opt. This is useless as the outer opt had only 1 inner opt.

theano/scan_module/scan_opt.py

@@ -1681,7 +1681,6 @@ scan_eqopt1 = theano.gof.EquilibriumDB()
 scan_seqopt1 = theano.gof.SequenceDB()
 
 scan_eqopt2 = theano.gof.EquilibriumDB()
-scan_seqopt2 = theano.gof.EquilibriumDB()
 # We run before blas opt at 1.7 and specialize 2.0
 # but after stabilize at 1.5. Should we put it before stabilize?
 optdb.register('scan_eqopt1', scan_eqopt1, .1, 'fast_run', 'scan')
@@ -1694,8 +1693,6 @@ optdb.register('scanOp_make_inplace',
                'inplace',
                'scan')
 
-scan_eqopt2.register(
-    'all_scan_opts', scan_seqopt2, 1, 'fast_run', 'scan')
 scan_eqopt1.register(
     'all_pushout_opt', scan_seqopt1, 1, 'fast_run', 'scan')
 
@@ -1731,7 +1728,7 @@ scan_seqopt1.register('scan_pushout_dot1',
                       'scan')
 
 
-scan_seqopt2.register('constant_folding_for_scan2',
+scan_eqopt2.register('constant_folding_for_scan2',
                       opt.in2out(tensor.opt.constant_folding,
                                  ignore_newtrees=True),
                       1,
@@ -1739,7 +1736,7 @@ scan_seqopt2.register('constant_folding_for_scan2',
                       'scan')
 
 
-scan_seqopt2.register('scanOp_remove_constants_and_unused_inputs1',
+scan_eqopt2.register('scanOp_remove_constants_and_unused_inputs1',
                       opt.in2out(remove_constants_and_unused_inputs_scan,
                                  ignore_newtrees=True),
                       2,
@@ -1751,14 +1748,14 @@ scan_seqopt2.register('scanOp_remove_constants_and_unused_inputs1',
 # after const merge but before stabilize so that we can have identity
 # for equivalent nodes but we still have the chance to hoist stuff out
 # of the scan later.
-scan_seqopt2.register('scanOp_merge',
+scan_eqopt2.register('scanOp_merge',
                       ScanMerge(),
                       4,
                       'fast_run',
                       'scan')
 
 # After Merge optimization
-scan_seqopt2.register('scanop_remove_constants_and_unused_inputs2',
+scan_eqopt2.register('scanop_remove_constants_and_unused_inputs2',
                       opt.in2out(remove_constants_and_unused_inputs_scan,
                                  ignore_newtrees=True),
                       5,
@@ -1766,7 +1763,7 @@ scan_seqopt2.register('scanop_remove_constants_and_unused_inputs2',
                       'fast_run',
                       'scan')
 
-scan_seqopt2.register('scanOp_merge_inouts',
+scan_eqopt2.register('scanOp_merge_inouts',
                       opt.in2out(scan_merge_inouts, ignore_newtrees=True),
                       6,
                       'scan_merge_inouts',
@@ -1776,14 +1773,14 @@ scan_seqopt2.register('scanOp_merge_inouts',
 # Just before specialize to have the other optimization
 # like constant folding being applied
 # This don't introduce inplace.
-scan_seqopt2.register('scanOp_save_mem',
+scan_eqopt2.register('scanOp_save_mem',
                       ScanSaveMem(),
                       7,
                       'fast_run',
                       'scan')
 
 # After everything else
-scan_seqopt2.register('scanOp_remove_constants_and_unused_inputs3',
+scan_eqopt2.register('scanOp_remove_constants_and_unused_inputs3',
                       opt.in2out(remove_constants_and_unused_inputs_scan,
                                  ignore_newtrees=True),
                       8,