* Allow users to add_label, in order to extend the entity recogniser to new classes. Does not by itself add a class to the model

spacy/syntax/transition_system.pxd

@@ -31,14 +31,12 @@ ctypedef int (*do_func_t)(StateClass state, int label) nogil
 cdef class TransitionSystem:
     cdef Pool mem
     cdef StringStore strings
-    cdef const Transition* c
-    cdef bint* _is_valid
+    cdef Transition* c
     cdef readonly int n_moves
+    cdef int _size
     cdef public int root_label
     cdef public freqs
 
-    cdef object _labels_by_action
-
     cdef int initialize_state(self, StateClass state) except -1
     cdef int finalize_state(self, StateClass state) nogil
 

spacy/syntax/transition_system.pyx

@@ -16,20 +16,17 @@ class OracleError(Exception):
 
 cdef class TransitionSystem:
     def __init__(self, StringStore string_table, dict labels_by_action, _freqs=None):
-        self._labels_by_action = labels_by_action
         self.mem = Pool()
-        self.n_moves = sum(len(labels) for labels in labels_by_action.values())
-        self._is_valid = <bint*>self.mem.alloc(self.n_moves, sizeof(bint))
-        moves = <Transition*>self.mem.alloc(self.n_moves, sizeof(Transition))
-        cdef int i = 0
-        cdef int label_id
         self.strings = string_table
+        self.n_moves = 0
+        self._size = 100
+        
+        self.c = <Transition*>self.mem.alloc(self._size, sizeof(Transition))
+        
         for action, label_strs in sorted(labels_by_action.items()):
             for label_str in sorted(label_strs):
-                label_id = self.strings[unicode(label_str)] if label_str else 0
-                moves[i] = self.init_transition(i, int(action), label_id)
-                i += 1
-        self.c = moves
+                self.add_action(int(action), label_str)
+        
         self.root_label = self.strings['ROOT']
         self.freqs = {} if _freqs is None else _freqs
         for attr in (TAG, HEAD, DEP, ENT_TYPE, ENT_IOB):
@@ -41,8 +38,13 @@ cdef class TransitionSystem:
             self.freqs[HEAD][-i] = 1
 
     def __reduce__(self):
+        labels_by_action = {}
+        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 (self.__class__,
-                (self.strings, self._labels_by_action, self.freqs),
+                (self.strings, labels_by_action, self.freqs),
                 None, None)
 
     cdef int initialize_state(self, StateClass state) except -1:
@@ -78,3 +80,14 @@ cdef class TransitionSystem:
                 costs[i] = self.c[i].get_cost(stcls, &gold.c, self.c[i].label)
             else:
                 costs[i] = 9000
+
+    def add_action(self, int action, label):
+        if self.n_moves >= self._size:
+            self._size *= 2
+            self.c = <Transition*>self.mem.realloc(self.c, self._size * sizeof(self.c[0]))
+
+        if not isinstance(label, int):
+            label = self.strings[label]
+        
+        self.c[self.n_moves] = self.init_transition(self.n_moves, action, label)
+        self.n_moves += 1