From a4d2b0c293a2fc733e2ab7561a5825f8daf21420 Mon Sep 17 00:00:00 2001
From: Matthew Honnibal <honnibal+gh@gmail.com>
Date: Fri, 29 Jun 2018 13:44:25 +0200
Subject: [PATCH] Fix bug when docs are empty

---
 spacy/pipeline.pyx | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/spacy/pipeline.pyx b/spacy/pipeline.pyx
index e913b2647..d43e6990c 100644
--- a/spacy/pipeline.pyx
+++ b/spacy/pipeline.pyx
@@ -447,6 +447,9 @@ class Tagger(Pipe):
             yield from docs
 
     def predict(self, docs):
+        if not any(len(doc) for doc in docs):
+            # Handle case where there are no tokens in any docs.
+            return [self.model.ops.allocate((0, self.model.nO) for doc in docs]
         tokvecs = self.model.tok2vec(docs)
         scores = self.model.softmax(tokvecs)
         guesses = []