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+# Copyright 2018 The TensorFlow Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ==============================================================================
+"""Tests for AdaMax optimizer."""
+
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+
+import numpy as np
+
+from tensorflow.compiler.tests import xla_test
+from tensorflow.contrib.opt.python.training import adamax
+from tensorflow.python.framework import constant_op
+from tensorflow.python.framework import ops
+from tensorflow.python.ops import resource_variable_ops
+from tensorflow.python.ops import variable_scope
+from tensorflow.python.ops import variables
+from tensorflow.python.platform import test
+
+
+def adamax_update_numpy(param,
+ g_t,
+ t,
+ m,
+ v,
+ alpha=0.001,
+ beta1=0.9,
+ beta2=0.999,
+ epsilon=1e-8):
+ m_t = beta1 * m + (1 - beta1) * g_t
+ v_t = np.maximum(beta2 * v, np.abs(g_t))
+ param_t = param - (alpha / (1 - beta1**t)) * (m_t / (v_t + epsilon))
+ return param_t, m_t, v_t
+
+
+class AdaMaxOptimizerTest(xla_test.XLATestCase):
+
+ def testBasic(self):
+ for i, dtype in enumerate(self.float_types):
+ with self.test_session(), self.test_scope():
+ variable_scope.get_variable_scope().set_use_resource(True)
+ # Initialize variables for numpy implementation.
+ m0, v0, m1, v1 = 0.0, 0.0, 0.0, 0.0
+ var0_np = np.array([1.0, 2.0], dtype=dtype)
+ grads0_np = np.array([0.1, 0.1], dtype=dtype)
+ var1_np = np.array([3.0, 4.0], dtype=dtype)
+ grads1_np = np.array([0.01, 0.01], dtype=dtype)
+
+ var0 = resource_variable_ops.ResourceVariable(
+ var0_np, name="var0_%d" % i)
+ var1 = resource_variable_ops.ResourceVariable(
+ var1_np, name="var1_%d" % i)
+ grads0 = constant_op.constant(grads0_np)
+ grads1 = constant_op.constant(grads1_np)
+
+ opt = adamax.AdaMaxOptimizer()
+ update = opt.apply_gradients(zip([grads0, grads1], [var0, var1]))
+ opt_variables = opt.variables()
+ beta1_power = opt._get_beta_accumulators()
+ self.assertTrue(beta1_power is not None)
+ self.assertIn(beta1_power, opt_variables)
+
+ with ops.Graph().as_default():
+ # Shouldn't return non-slot variables from other graphs.
+ self.assertEqual(0, len(opt.variables()))
+
+ variables.global_variables_initializer().run()
+ # Fetch params to validate initial values
+ self.assertAllClose([1.0, 2.0], var0.eval())
+ self.assertAllClose([3.0, 4.0], var1.eval())
+
+ beta1_power = opt._get_beta_accumulators()
+
+ # Run 3 steps of AdaMax
+ for t in range(1, 4):
+ update.run()
+
+ self.assertAllCloseAccordingToType(0.9**(t + 1), beta1_power.eval())
+
+ var0_np, m0, v0 = adamax_update_numpy(var0_np, grads0_np, t, m0, v0)
+ var1_np, m1, v1 = adamax_update_numpy(var1_np, grads1_np, t, m1, v1)
+
+ # Validate updated params
+ self.assertAllCloseAccordingToType(var0_np, var0.eval(), rtol=1e-2)
+ self.assertAllCloseAccordingToType(var1_np, var1.eval(), rtol=1e-2)
+ self.assertEqual("var0_%d/AdaMax:0" % (i,),
+ opt.get_slot(var=var0, name="m").name)
+
+ def testTensorLearningRate(self):
+ for dtype in self.float_types:
+ with self.test_session(), self.test_scope():
+ variable_scope.get_variable_scope().set_use_resource(True)
+ # Initialize variables for numpy implementation.
+ m0, v0, m1, v1 = 0.0, 0.0, 0.0, 0.0
+ var0_np = np.array([1.0, 2.0], dtype=dtype)
+ grads0_np = np.array([0.1, 0.1], dtype=dtype)
+ var1_np = np.array([3.0, 4.0], dtype=dtype)
+ grads1_np = np.array([0.01, 0.01], dtype=dtype)
+
+ var0 = resource_variable_ops.ResourceVariable(var0_np)
+ var1 = resource_variable_ops.ResourceVariable(var1_np)
+ grads0 = constant_op.constant(grads0_np)
+ grads1 = constant_op.constant(grads1_np)
+ opt = adamax.AdaMaxOptimizer(constant_op.constant(0.001))
+ update = opt.apply_gradients(zip([grads0, grads1], [var0, var1]))
+ variables.global_variables_initializer().run()
+
+ # Fetch params to validate initial values
+ self.assertAllClose([1.0, 2.0], var0.eval())
+ self.assertAllClose([3.0, 4.0], var1.eval())
+
+ beta1_power = opt._get_beta_accumulators()
+
+ # Run 3 steps of AdaMax
+ for t in range(1, 4):
+ self.assertAllCloseAccordingToType(0.9**t, beta1_power.eval())
+ update.run()
+
+ var0_np, m0, v0 = adamax_update_numpy(var0_np, grads0_np, t, m0, v0)
+ var1_np, m1, v1 = adamax_update_numpy(var1_np, grads1_np, t, m1, v1)
+
+ # Validate updated params
+ self.assertAllCloseAccordingToType(var0_np, var0.eval())
+ self.assertAllCloseAccordingToType(var1_np, var1.eval())
+
+if __name__ == "__main__":
+ test.main()