From 31af39f85194d13d951dca413dc6750009dea539 Mon Sep 17 00:00:00 2001
From: Matthw Honnibal <honnibal+gh@gmail.com>
Date: Tue, 19 Nov 2019 11:17:56 +0100
Subject: [PATCH] Fix depth=0, maxout pieces=0

---
 spacy/syntax/_parser_model.pyx | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/spacy/syntax/_parser_model.pyx b/spacy/syntax/_parser_model.pyx
index f5369fbd1..c20c8bdde 100644
--- a/spacy/syntax/_parser_model.pyx
+++ b/spacy/syntax/_parser_model.pyx
@@ -493,13 +493,16 @@ cdef class precompute_hiddens:
             if self.activation == "relu":
                 mask = state_vector >= 0.
                 state_vector *= mask
+            else:
+                mask = None
 
         def backprop_nonlinearity(d_best, sgd=None):
             if isinstance(d_best, numpy.ndarray):
                 ops = NumpyOps()
             else:
                 ops = CupyOps()
-            mask_ = ops.asarray(mask)
+            if mask is not None:
+                mask_ = ops.asarray(mask)
 
             # This will usually be on GPU
             d_best = ops.asarray(d_best)