Use ordered dict to specify actions

spacy/syntax/arc_eager.pyx

@@ -9,6 +9,7 @@ import ctypes
 from libc.stdint cimport uint32_t
 from libc.string cimport memcpy
 from cymem.cymem cimport Pool
+from collections import OrderedDict
 
 from .stateclass cimport StateClass
 from ._state cimport StateC, is_space_token
@@ -312,12 +313,13 @@ cdef class ArcEager(TransitionSystem):
     @classmethod
     def get_actions(cls, **kwargs):
         actions = kwargs.get('actions',
-                    {
-                        SHIFT: [''],
-                        REDUCE: [''],
-                        RIGHT: [],
-                        LEFT: [],
-                        BREAK: ['ROOT']})
+                    OrderedDict((
+                        (SHIFT, ['']),
+                        (REDUCE, ['']),
+                        (RIGHT, []),
+                        (LEFT, []),
+                        (BREAK, ['ROOT'])
+                    )))
         seen_actions = set()
         for label in kwargs.get('left_labels', []):
             if label.upper() != 'ROOT':

spacy/syntax/ner.pyx

@@ -2,6 +2,7 @@
 from __future__ import unicode_literals
 
 from thinc.typedefs cimport weight_t
+from collections import OrderedDict
 
 from .stateclass cimport StateClass
 from ._state cimport StateC
@@ -51,17 +52,29 @@ cdef bint _entity_is_sunk(StateClass st, Transition* golds) nogil:
 
 
 cdef class BiluoPushDown(TransitionSystem):
+    def __init__(self, *args, **kwargs):
+        TransitionSystem.__init__(self, *args, **kwargs)
+
+    def __reduce__(self):
+        labels_by_action = OrderedDict()
+        cdef Transition t
+        for trans in self.c[:self.n_moves]:
+            label_str = self.strings[trans.label]
+            labels_by_action.setdefault(trans.move, []).append(label_str)
+        return (BiluoPushDown, (self.strings, labels_by_action),
+                None, None)
+
     @classmethod
     def get_actions(cls, **kwargs):
         actions = kwargs.get('actions',
-                    {
-                        MISSING: [''],
-                        BEGIN: [],
-                        IN: [],
-                        LAST: [],
-                        UNIT: [],
-                        OUT: ['']
-                    })
+                    OrderedDict((
+                        (MISSING, ['']),
+                        (BEGIN, []),
+                        (IN, []),
+                        (LAST, []),
+                        (UNIT, []),
+                        (OUT, [''])
+                    )))
         seen_entities = set()
         for entity_type in kwargs.get('entity_types', []):
             if entity_type in seen_entities:
@@ -90,7 +103,7 @@ cdef class BiluoPushDown(TransitionSystem):
     def move_name(self, int move, int label):
         if move == OUT:
             return 'O'
-        elif move == 'MISSING':
+        elif move == MISSING:
             return 'M'
         else:
             return MOVE_NAMES[move] + '-' + self.strings[label]