diff --git a/AUTHORS.rst b/AUTHORS.rst
index f05496db..521e7005 100644
--- a/AUTHORS.rst
+++ b/AUTHORS.rst
@@ -1,2 +1,4 @@
 keras-rcnn was written by Allen Goodman. It’s maintained by Allen Goodman and
 various contributors:
+
+Jane Hung
diff --git a/keras_rcnn/metrics.py b/keras_rcnn/metrics.py
index e69de29b..9d46f524 100644
--- a/keras_rcnn/metrics.py
+++ b/keras_rcnn/metrics.py
@@ -0,0 +1,4 @@
+import tensorflow
+
+def mean_average_precision(y_true, y_pred):
+    return tensorflow.reduce_mean(tensorflow.metrics.sparse_average_precision_at_k(tensorflow.cast(y_true, tensorflow.int64), y_pred, 1)[0])
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