From bea44bd3c41d684346228790b06908faedb4b321 Mon Sep 17 00:00:00 2001
From: Matthew Honnibal <honnibal+gh@gmail.com>
Date: Sun, 23 Oct 2016 14:23:56 +0200
Subject: [PATCH] Fix vector_norm when vector is assigned to Lexeme.

---
 spacy/lexeme.pyx | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/spacy/lexeme.pyx b/spacy/lexeme.pyx
index 01305e855..638cd6365 100644
--- a/spacy/lexeme.pyx
+++ b/spacy/lexeme.pyx
@@ -1,4 +1,5 @@
 # cython: embedsignature=True
+from libc.math cimport sqrt
 from cpython.ref cimport Py_INCREF
 from cymem.cymem cimport Pool
 from murmurhash.mrmr cimport hash64
@@ -115,8 +116,11 @@ cdef class Lexeme:
         def __set__(self, vector):
             assert len(vector) == self.vocab.vectors_length
             cdef float value
+            cdef double norm = 0.0
             for i, value in enumerate(vector):
                 self.c.vector[i] = value
+                norm += value * value
+            self.c.l2_norm = sqrt(norm)
 
     property rank:
         def __get__(self):