Merge 9fa35951ab into adc7bbd6cf

setup.py

@@ -163,7 +163,7 @@ def run_setup(exts):
                   'spacy.tests.munge',
                   'spacy.tests.parser',
                   'spacy.tests.serialize',
-                  'spacy.tests.span',
+                  'spacy.tests.spans',
                   'spacy.tests.tagger',
                   'spacy.tests.tokenizer',
                   'spacy.tests.tokens',

spacy/tests/spans/test_merge.py

@@ -1,7 +1,6 @@
 from __future__ import unicode_literals
 import pytest
 
-@pytest.mark.models
 def test_merge_tokens(EN):
     tokens = EN(u'Los Angeles start.')
     assert len(tokens) == 4
@@ -13,7 +12,6 @@ def test_merge_tokens(EN):
     assert tokens[0].head.orth_ == 'start'
 
 
-@pytest.mark.models
 def test_merge_heads(EN):
     tokens = EN(u'I found a pilates class near work.')
     assert len(tokens) == 8
@@ -32,7 +30,6 @@ def test_issue_54(EN):
     text = u'Talks given by women had a slightly higher number of questions asked (3.2$\pm$0.2) than talks given by men (2.6$\pm$0.1).'
     tokens = EN(text)
 
-@pytest.mark.models
 def test_np_merges(EN):
     text = u'displaCy is a parse tool built with Javascript'
     tokens = EN(text)
@@ -47,3 +44,27 @@ def test_np_merges(EN):
         merged = tokens.merge(start, end, label, lemma, label)
         assert merged != None, (start, end, label, lemma) 
 
+def test_entity_merge(EN):
+    tokens = EN(u'Stewart Lee is a stand up comedian who lives in England and loves Joe Pasquale')
+    assert(len(tokens) == 15)
+    for ent in tokens.ents:
+        label, lemma, type_ = (ent.root.tag_, ent.root.lemma_, max(w.ent_type_ for w in ent))
+        ent.merge(label, lemma, type_)
+    # check looping is ok
+    assert(len(tokens) == 13)
+
+def test_sentence_update_after_merge(EN):
+    tokens = EN(u'Stewart Lee is a stand up comedian. He lives in England and loves Joe Pasquale')
+    sent1, sent2 = list(tokens.sents)
+    init_len = len(sent1)
+    merge_me = tokens[0:2]
+    merge_me.merge(u'none', u'none', u'none')
+    assert(len(sent1) == init_len - 1)
+
+def test_subtree_size_check(EN):
+    tokens = EN(u'Stewart Lee is a stand up comedian who lives in England and loves Joe Pasquale')
+    sent1 = list(tokens.sents)[0]
+    init_len = len(list(sent1.root.subtree))
+    merge_me = tokens[0:2]
+    merge_me.merge(u'none', u'none', u'none')
+    assert(len(list(sent1.root.subtree)) == init_len - 1)

spacy/tokens/doc.pyx

@@ -438,11 +438,26 @@ cdef class Doc:
                 keep_reading = False
             yield n_bytes_str + data
 
-    # This function is terrible --- need to fix this.
-    def merge(self, int start_idx, int end_idx, unicode tag, unicode lemma,
-              unicode ent_type):
-        """Merge a multi-word expression into a single token.  Currently
-        experimental; API is likely to change."""
+
+    def token_index_start(self, int start_idx):
+        """ Get index of token in doc that has character index start_idx """
+        cdef int i
+        for i in range(self.length):
+            if self.c[i].idx == start_idx:
+                return i
+        return None
+
+    def token_index_end(self, int end_idx):
+        """ Get index+1 of token in doc ending with character index end_idx """
+        cdef int i
+        for i in range(self.length):
+            if (self.c[i].idx + self.c[i].lex.length) == end_idx:
+                return i + 1
+        return None
+
+    def range_from_indices(self, int start_idx, int end_idx):
+        """ Get tuple - span of token indices which correspond to
+            character indices (start_idx, end_idx) if such a span exists"""
         cdef int i
         cdef int start = -1
         cdef int end = -1
@@ -453,10 +468,18 @@ cdef class Doc:
                 if start == -1:
                     return None
                 end = i + 1
-                break
-        else:
+                return (start, end)
         return None
 
+    # This function is terrible --- need to fix this.
+    def merge(self, int start_idx, int end_idx, unicode tag, unicode lemma,
+              unicode ent_type):
+        """Merge a multi-word expression into a single token.  Currently
+        experimental; API is likely to change."""
+        start_end = self.range_from_indices(start_idx, end_idx)
+        if start_end is None:
+            return None
+        start, end = start_end
         cdef Span span = self[start:end]
         # Get LexemeC for newly merged token
         new_orth = ''.join([t.text_with_ws for t in span])
@@ -465,8 +488,6 @@ cdef class Doc:
         cdef const LexemeC* lex = self.vocab.get(self.mem, new_orth)
         # House the new merged token where it starts
         cdef TokenC* token = &self.c[start]
-        # Update fields
-        token.lex = lex
         token.spacy = self.c[end-1].spacy
         if tag in self.vocab.morphology.tag_map:
             self.vocab.morphology.assign_tag(token, tag)
@@ -485,6 +506,10 @@ cdef class Doc:
         # bridges over the entity. Here the alignment of the tokens changes.
         span_root = span.root.i
         token.dep = span.root.dep
+        # We update token.lex after keeping span root and dep, since
+        # setting token.lex will change span.start and span.end properties
+        # as it modifies the character offsets in the doc
+        token.lex = lex
         for i in range(self.length):
             self.c[i].head += i
         # Set the head of the merged token, and its dep relation, from the Span

spacy/tokens/span.pxd

@@ -4,8 +4,10 @@ from .doc cimport Doc
 cdef class Span:
     cdef readonly Doc doc
     cdef public int i
-    cdef public int start
-    cdef public int end
+    cdef public int start_token
+    cdef public int end_token
+    cdef public int start_idx
+    cdef public int end_idx
     cdef readonly int label
 
     cdef public _vector

spacy/tokens/span.pyx

@@ -14,15 +14,19 @@ from ..util import normalize_slice
 
 
 cdef class Span:
-    """A slice from a Doc object."""
+    """A slice from a Doc object. Internally keeps character offsets in order
+       to keep track of changes (merges) in the original Doc. Updates are
+       made in start and end property."""
     def __cinit__(self, Doc tokens, int start, int end, int label=0, vector=None,
                   vector_norm=None):
         if not (0 <= start <= end <= len(tokens)):
             raise IndexError
 
         self.doc = tokens
-        self.start = start
-        self.end = end
+        self.start_token = start
+        self.start_idx = self.doc[start].idx
+        self.end_token = end
+        self.end_idx = self.doc[end - 1].idx + len(self.doc[end - 1])
         self.label = label
         self._vector = vector
         self._vector_norm = vector_norm
@@ -76,6 +80,40 @@ cdef class Span:
             return 0.0
         return numpy.dot(self.vector, other.vector) / (self.vector_norm * other.vector_norm)
 
+    property start:
+        """ Get start token index of this span from the Doc."""
+        def __get__(self):
+            # if we have merged spans in Doc start might have changed.
+            # check if token start index is in doc index range and the token
+            # index is start_idx (it hasn't changed).
+            # Potential IndexError if only second condition was used
+            if self.start_token >= len(self.doc) or self.doc[self.start_token].idx != self.start_idx:
+                # go through tokens in Doc - find index of token equal to start_idx
+                new_start = self.doc.token_index_start(self.start_idx)
+                if new_start is not None:
+                    self.start_token = new_start
+                else:
+                    raise IndexError('Something went terribly wrong during a merge.'
+                                     'No token found with idx %s' % self.start_idx)
+            return self.start_token
+
+    property end:
+        """ Get end token index of this span from the Doc."""
+        def __get__(self):
+            # if we have merged spans in Doc end will have changed.
+            # check if token end index is in doc index range and the token
+            # index is end_idx (it hasn't changed).
+            # Potential IndexError if only second condition was used
+            if self.end_token >= len(self.doc) or self.doc[self.end_token - 1].idx != self.end_idx:
+                # go through tokens in Doc - find index of token equal to end_idx
+                new_end = self.doc.token_index_end(self.end_idx)
+                if new_end is not None:
+                    self.end_token = new_end
+                else:
+                    raise IndexError('Something went terribly wrong during a merge.'
+                                     'No token found with idx %s' % self.end_idx)
+            return self.end_token
+
     property vector:
         def __get__(self):
             if self._vector is None: