From 531a8eabe222c3831cc5b55bafc81d2aa36f0672 Mon Sep 17 00:00:00 2001
From: charlesbensimon <charles.bensimon@gmail.com>
Date: Tue, 20 Feb 2018 19:43:14 +0100
Subject: [PATCH] Optimizer - set_weights : check weights length (#9435)

---
 keras/optimizers.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/keras/optimizers.py b/keras/optimizers.py
index 5ea63dccb62..afa93d45bf1 100644
--- a/keras/optimizers.py
+++ b/keras/optimizers.py
@@ -106,6 +106,11 @@ def set_weights(self, weights):
             ValueError: in case of incompatible weight shapes.
         """
         params = self.weights
+        if len(params) != len(weights):
+            raise ValueError('Length of the specified weight list (' +
+                             str(len(weights)) +
+                             ') does not match the number of weights ' +
+                             'of the optimizer (' + str(len(params)) + ')')
         weight_value_tuples = []
         param_values = K.batch_get_value(params)
         for pv, p, w in zip(param_values, params, weights):