def testPrecomputedGradient(self):
for dtype in [dtypes.half, dtypes.float32, dtypes.float64]:
with self.cached_session():
var0 = variables.Variable([1.0, 2.0], dtype=dtype)
var1 = variables.Variable([3.0, 4.0], dtype=dtype)
cost = 5 * var0 + 3 * var1
grad_loss = constant_op.constant([42, -42], dtype=dtype)
global_step = variables.Variable(array_ops.zeros([],
dtypes.int64),
name='global_step')
sgd_op = gradient_descent.GradientDescentOptimizer(3.0)
opt_op = sgd_op.minimize(cost,
global_step, [var0, var1],
grad_loss=grad_loss)
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())
# Run 1 step of sgd through optimizer
opt_op.run()
# Validate updated params
self.assertAllClose(
[1.0 - 3 * 5 * 42.0, 2.0 - 3 * 5 * (-42.0)], var0.eval())
self.assertAllClose(
[3.0 - 3 * 3 * 42.0, 4.0 - 3 * 3 * (-42.0)], var1.eval())
def testBasicResourceVariable(self):
for dtype in [dtypes.half, dtypes.float32, dtypes.float64]:
with self.test_session():
var0 = resource_variable_ops.ResourceVariable([1.0, 2.0],
dtype=dtype)
var1 = resource_variable_ops.ResourceVariable([3.0, 4.0],
dtype=dtype)
grads0 = constant_op.constant([0.1, 0.1], dtype=dtype)
grads1 = constant_op.constant([0.01, 0.01], dtype=dtype)
sgd_op = gradient_descent.GradientDescentOptimizer(
3.0).apply_gradients(zip([grads0, grads1], [var0, var1]))
# TODO(apassos) calling initialize_resources on all resources here
# doesn't work because the sessions and graph are reused across unit
# tests and this would mean trying to reinitialize variables. Figure out
# a long-term solution for this.
resources.initialize_resources([var0, var1]).run()
# Fetch params to validate initial values
self.assertAllCloseAccordingToType([1.0, 2.0], var0.eval())
self.assertAllCloseAccordingToType([3.0, 4.0], var1.eval())
# Run 1 step of sgd
sgd_op.run()
# Validate updated params
self.assertAllCloseAccordingToType(
[1.0 - 3.0 * 0.1, 2.0 - 3.0 * 0.1], var0.eval())
self.assertAllCloseAccordingToType(
[3.0 - 3.0 * 0.01, 4.0 - 3.0 * 0.01], var1.eval())
def testMinimizeResourceVariable(self):
for dtype in [dtypes.half, dtypes.float32, dtypes.float64]:
with self.cached_session():
var0 = resource_variable_ops.ResourceVariable([[1.0, 2.0]], dtype=dtype)
var1 = resource_variable_ops.ResourceVariable([3.0], dtype=dtype)
x = constant_op.constant([[4.0], [5.0]], dtype=dtype)
pred = math_ops.matmul(var0, x) + var1
loss = pred * pred
sgd_op = gradient_descent.GradientDescentOptimizer(1.0).minimize(loss)
# TODO(apassos) calling initialize_resources on all resources here
# doesn't work because the sessions and graph are reused across unit
# tests and this would mean trying to reinitialize variables. Figure out
# a long-term solution for this.
resources.initialize_resources([var0, var1]).run()
# Fetch params to validate initial values
self.assertAllCloseAccordingToType([[1.0, 2.0]], var0.eval())
self.assertAllCloseAccordingToType([3.0], var1.eval())
# Run 1 step of sgd
sgd_op.run()
# Validate updated params
np_pred = 1.0 * 4.0 + 2.0 * 5.0 + 3.0
np_grad = 2 * np_pred
self.assertAllCloseAccordingToType(
[[1.0 - np_grad * 4.0, 2.0 - np_grad * 5.0]], var0.eval())
self.assertAllCloseAccordingToType([3.0 - np_grad], var1.eval())
def testBasic(self):
for i, dtype in enumerate(
[dtypes.half, dtypes.float32, dtypes.float64]):
var0 = resource_variable_ops.ResourceVariable([1.0, 2.0],
dtype=dtype)
var1 = resource_variable_ops.ResourceVariable([3.0, 4.0],
dtype=dtype)
def loss():
return 5 * var0 + 3 * var1 # pylint: disable=cell-var-from-loop
# Note that for eager execution, minimize expects a function instead of a
# Tensor.
global_step = resource_variable_ops.ResourceVariable(
array_ops.zeros([], dtypes.int64), name='global_step_%d' % i)
sgd_op = gradient_descent.GradientDescentOptimizer(3.0)
self.evaluate(variables.global_variables_initializer())
# Fetch params to validate initial values
self.assertAllClose([1.0, 2.0], self.evaluate(var0))
self.assertAllClose([3.0, 4.0], self.evaluate(var1))
# Run 1 step of sgd through optimizer
opt_op = sgd_op.minimize(loss, global_step, [var0, var1])
self.evaluate(opt_op)
# Validate updated params
self.assertAllClose([-14., -13.], self.evaluate(var0))
self.assertAllClose([-6., -5.], self.evaluate(var1))
def testSparseBasic(self):
for dtype in [dtypes.half, dtypes.float32, dtypes.float64]:
with self.cached_session():
var0 = variables.Variable([[1.0], [2.0]], dtype=dtype)
var1 = variables.Variable([[3.0], [4.0]], dtype=dtype)
grads0 = ops.IndexedSlices(
constant_op.constant(
[0.1], shape=[1, 1], dtype=dtype),
constant_op.constant([0]),
constant_op.constant([2, 1]))
grads1 = ops.IndexedSlices(
constant_op.constant(
[0.01], shape=[1, 1], dtype=dtype),
constant_op.constant([1]),
constant_op.constant([2, 1]))
sgd_op = gradient_descent.GradientDescentOptimizer(3.0).apply_gradients(
zip([grads0, grads1], [var0, var1]))
variables.global_variables_initializer().run()
# Fetch params to validate initial values
self.assertAllCloseAccordingToType([[1.0], [2.0]], var0.eval())
self.assertAllCloseAccordingToType([[3.0], [4.0]], var1.eval())
# Run 1 step of sgd
sgd_op.run()
# Validate updated params
self.assertAllCloseAccordingToType([[1.0 - 3.0 * 0.1], [2.0]],
var0.eval())
self.assertAllCloseAccordingToType([[3.0], [4.0 - 3.0 * 0.01]],
var1.eval())
def testAggregationMethod(self):
for dtype in [dtypes.half, dtypes.float32, dtypes.float64]:
with self.cached_session():
var0 = variables.Variable([1.0, 2.0], dtype=dtype)
var1 = variables.Variable([3.0, 4.0], dtype=dtype)
cost = 5 * var0 + 3 * var1
global_step = variables.Variable(array_ops.zeros([],
dtypes.int64),
name='global_step')
sgd_op = gradient_descent.GradientDescentOptimizer(3.0)
opt_op = sgd_op.minimize(
cost,
global_step, [var0, var1],
aggregation_method=gradients_impl.AggregationMethod.
EXPERIMENTAL_ACCUMULATE_N)
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())
# Run 1 step of sgd through optimizer
opt_op.run()
# Validate updated params
self.assertAllClose([-14., -13.], var0.eval())
self.assertAllClose([-6., -5.], var1.eval())
def testGradWrtRef(self):
for dtype in [dtypes.half, dtypes.float32, dtypes.float64]:
with self.cached_session():
opt = gradient_descent.GradientDescentOptimizer(3.0)
values = [1.0, 3.0]
vars_ = [variables.Variable([v], dtype=dtype) for v in values]
grads_and_vars = opt.compute_gradients(vars_[0] + vars_[1], vars_)
variables.global_variables_initializer().run()
for grad, _ in grads_and_vars:
self.assertAllCloseAccordingToType([1.0], grad.eval())
def testTrainOp(self):
with self.cached_session():
var0 = variables.Variable([1.0, 2.0])
var1 = variables.Variable([3.0, 4.0])
cost = 5 * var0 + 3 * var1
global_step = variables.Variable(array_ops.zeros([], dtypes.int64),
name='global_step')
sgd_op = gradient_descent.GradientDescentOptimizer(3.0)
opt_op = sgd_op.minimize(cost, global_step, [var0, var1])
self.assertTrue(
opt_op in ops.get_collection(ops.GraphKeys.TRAIN_OP))
def testNoGradientsForAnyVariables_ApplyGradients(self):
for i, dtype in enumerate(
[dtypes.half, dtypes.float32, dtypes.float64]):
var0 = resource_variable_ops.ResourceVariable([1.0, 2.0],
dtype=dtype)
var1 = resource_variable_ops.ResourceVariable([3.0, 4.0],
dtype=dtype)
sgd_op = gradient_descent.GradientDescentOptimizer(3.0)
with self.assertRaisesRegexp(
ValueError, 'No gradients provided for any variable'):
sgd_op.apply_gradients([(None, var0), (None, var1)])
def testStopGradients(self):
with self.cached_session():
var0 = variables.Variable([1.0, 2.0], name='var0')
var1 = variables.Variable([3.0, 4.0], name='var1')
var0_id = array_ops.identity(var0)
cost = 5 * var0_id + 3 * var1
sgd_op = gradient_descent.GradientDescentOptimizer(3.0)
grads_and_vars = sgd_op.compute_gradients(cost, [var0, var1],
stop_gradients=[var0_id])
grad_dict = {var.op.name: grad for grad, var in grads_and_vars}
self.assertIsNone(grad_dict['var0'])
self.assertIsNotNone(grad_dict['var1'])
def testNoGradientsForAnyVariables_Minimize(self):
for i, dtype in enumerate(
[dtypes.half, dtypes.float32, dtypes.float64]):
var0 = resource_variable_ops.ResourceVariable([1.0, 2.0],
dtype=dtype)
var1 = resource_variable_ops.ResourceVariable([3.0, 4.0],
dtype=dtype)
def loss():
return constant_op.constant(5.0)
sgd_op = gradient_descent.GradientDescentOptimizer(3.0)
with self.assertRaisesRegexp(
ValueError, 'No gradients provided for any variable'):
sgd_op.minimize(loss, var_list=[var0, var1])
def testNoGradientsForAnyVariables_ApplyGradients(self):
for i, dtype in enumerate(
[dtypes.half, dtypes.float32, dtypes.float64]):
# Note that we name the variables uniquely here since the variables don't
# seem to be getting deleted at the end of the loop.
var0 = resource_variable_ops.ResourceVariable([1.0, 2.0],
dtype=dtype,
name='a_%d' % i)
var1 = resource_variable_ops.ResourceVariable([3.0, 4.0],
dtype=dtype,
name='b_%d' % i)
sgd_op = gradient_descent.GradientDescentOptimizer(3.0)
with self.assertRaisesRegexp(
ValueError, 'No gradients provided for any variable'):
sgd_op.apply_gradients([(None, var0), (None, var1)])
def testComputeGradientsWithTensors(self):
x = ops.convert_to_tensor(1.0)
def f():
return x * x
sgd_op = gradient_descent.GradientDescentOptimizer(3.0)
grads_and_vars = sgd_op.compute_gradients(f, [x])
self.assertEqual(1, len(grads_and_vars))
grad, x_as_var = grads_and_vars[0]
self.assertIs(x, x_as_var)
self.assertEqual(2.0, self.evaluate(grad))
with self.assertRaises(NotImplementedError):
sgd_op.apply_gradients(grads_and_vars)
def testNoGradients(self):
for i, dtype in enumerate(
[dtypes.half, dtypes.float32, dtypes.float64]):
var0 = resource_variable_ops.ResourceVariable([1.0, 2.0],
dtype=dtype)
var1 = resource_variable_ops.ResourceVariable([3.0, 4.0],
dtype=dtype)
# pylint: disable=cell-var-from-loop
def loss():
return 5 * var0
# pylint: enable=cell-var-from-loop
sgd_op = gradient_descent.GradientDescentOptimizer(3.0)
with self.assertRaisesRegexp(ValueError, 'No gradients'):
# var1 has no gradient
sgd_op.minimize(loss, var_list=[var1])
def testNoVariables(self):
for dtype in [dtypes.half, dtypes.float32, dtypes.float64]:
# pylint: disable=cell-var-from-loop
def loss():
var0 = resource_variable_ops.ResourceVariable([1.0, 2.0],
dtype=dtype,
trainable=False,
name='a')
var1 = resource_variable_ops.ResourceVariable([3.0, 4.0],
dtype=dtype,
trainable=False,
name='b')
return 5 * var0 + var1
# pylint: enable=cell-var-from-loop
sgd_op = gradient_descent.GradientDescentOptimizer(3.0)
with self.assertRaisesRegexp(ValueError, 'No.*variables'):
sgd_op.minimize(loss)
def testGradientsAsVariables(self):
for i, dtype in enumerate(
[dtypes.half, dtypes.float32, dtypes.float64]):
# Note that we name the variables uniquely here since the variables don't
# seem to be getting deleted at the end of the loop.
var0 = resource_variable_ops.ResourceVariable([1.0, 2.0],
dtype=dtype,
name='a%d' % i)
var1 = resource_variable_ops.ResourceVariable([3.0, 4.0],
dtype=dtype,
name='b%d' % i)
def loss():
return 5 * var0 + 3 * var1 # pylint: disable=cell-var-from-loop
sgd_op = gradient_descent.GradientDescentOptimizer(3.0)
grads_and_vars = sgd_op.compute_gradients(loss, [var0, var1])
# Convert gradients to tf.Variables
converted_grads = [
resource_variable_ops.ResourceVariable(array_ops.zeros([2],
dtype),
name='c_%d_%d' % (i, j))
for j, gv in enumerate(grads_and_vars)
]
convert_ops = [
state_ops.assign(converted_grads[j], gv[0])
for j, gv in enumerate(grads_and_vars)
]
self.evaluate(variables.global_variables_initializer())
# Run convert_ops to achieve the gradietns converting
self.evaluate(convert_ops)
# Fetch params to validate initial values
self.assertAllClose([1.0, 2.0], self.evaluate(var0))
self.assertAllClose([3.0, 4.0], self.evaluate(var1))
# Run 1 step of sgd through optimizer
converted_grads_and_vars = list(zip(converted_grads, [var0, var1]))
opt_op = sgd_op.apply_gradients(converted_grads_and_vars)
self.evaluate(opt_op)
# Validate updated params
self.assertAllClose([-14., -13.], self.evaluate(var0))
self.assertAllClose([-6., -5.], self.evaluate(var1))
def testNoGradientsForAnyVariables_Minimize(self):
for i, dtype in enumerate(
[dtypes.half, dtypes.float32, dtypes.float64]):
# Note that we name the variables uniquely here since the variables don't
# seem to be getting deleted at the end of the loop.
var0 = resource_variable_ops.ResourceVariable([1.0, 2.0],
dtype=dtype,
name='a_%d' % i)
var1 = resource_variable_ops.ResourceVariable([3.0, 4.0],
dtype=dtype,
name='b_%d' % i)
def loss():
return constant_op.constant(5.0)
sgd_op = gradient_descent.GradientDescentOptimizer(3.0)
with self.assertRaisesRegexp(
ValueError, 'No gradients provided for any variable'):
sgd_op.minimize(loss, var_list=[var0, var1])
def testTensorLearningRate(self):
for dtype in [dtypes.half, dtypes.float32, dtypes.float64]:
with self.cached_session():
var0 = variables.Variable([1.0, 2.0], dtype=dtype)
var1 = variables.Variable([3.0, 4.0], dtype=dtype)
grads0 = constant_op.constant([0.1, 0.1], dtype=dtype)
grads1 = constant_op.constant([0.01, 0.01], dtype=dtype)
lrate = constant_op.constant(3.0)
sgd_op = gradient_descent.GradientDescentOptimizer(
lrate).apply_gradients(zip([grads0, grads1], [var0, var1]))
variables.global_variables_initializer().run()
# Fetch params to validate initial values
self.assertAllCloseAccordingToType([1.0, 2.0], var0.eval())
self.assertAllCloseAccordingToType([3.0, 4.0], var1.eval())
# Run 1 step of sgd
sgd_op.run()
# Validate updated params
self.assertAllCloseAccordingToType([1.0 - 3.0 * 0.1, 2.0 - 3.0 * 0.1],
var0.eval())
self.assertAllCloseAccordingToType([3.0 - 3.0 * 0.01, 4.0 - 3.0 * 0.01],
var1.eval())
def testConstraint(self):
constraint_01 = lambda x: clip_ops.clip_by_value(x, -0.1, 0.)
constraint_0 = lambda x: clip_ops.clip_by_value(x, 0., 1.)
with self.cached_session():
var0 = variables.Variable([1.0, 2.0], constraint=constraint_01)
var1 = variables.Variable([3.0, 4.0], constraint=constraint_0)
cost = 5 * var0 + 3 * var1
global_step = variables.Variable(array_ops.zeros([], dtypes.int64),
name='global_step')
sgd_op = gradient_descent.GradientDescentOptimizer(3.0)
opt_op = sgd_op.minimize(cost, global_step, [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())
# Run 1 step of sgd through optimizer
opt_op.run()
# Validate updated params
self.assertAllClose([-0.1, -0.1], var0.eval())
self.assertAllClose([0., 0.], var1.eval())
def testNoGradients(self):
for i, dtype in enumerate(
[dtypes.half, dtypes.float32, dtypes.float64]):
# Note that we name the variables uniquely here since the variables don't
# seem to be getting deleted at the end of the loop.
var0 = resource_variable_ops.ResourceVariable([1.0, 2.0],
dtype=dtype,
name='a%d' % i)
var1 = resource_variable_ops.ResourceVariable([3.0, 4.0],
dtype=dtype,
name='b%d' % i)
# pylint: disable=cell-var-from-loop
def loss():
return 5 * var0
# pylint: enable=cell-var-from-loop
sgd_op = gradient_descent.GradientDescentOptimizer(3.0)
with self.assertRaisesRegexp(ValueError, 'No gradients'):
# var1 has no gradient
sgd_op.minimize(loss, var_list=[var1])
def testWithGlobalStep(self):
for dtype in [dtypes.half, dtypes.float32, dtypes.float64]:
with self.cached_session():
global_step = variables.Variable(0, trainable=False)
var0 = variables.Variable([1.0, 2.0], dtype=dtype)
var1 = variables.Variable([3.0, 4.0], dtype=dtype)
grads0 = constant_op.constant([0.1, 0.1], dtype=dtype)
grads1 = constant_op.constant([0.01, 0.01], dtype=dtype)
sgd_op = gradient_descent.GradientDescentOptimizer(3.0).apply_gradients(
zip([grads0, grads1], [var0, var1]), global_step=global_step)
variables.global_variables_initializer().run()
# Fetch params to validate initial values
self.assertAllCloseAccordingToType([1.0, 2.0], var0.eval())
self.assertAllCloseAccordingToType([3.0, 4.0], var1.eval())
# Run 1 step of sgd
sgd_op.run()
# Validate updated params and global_step
self.assertAllCloseAccordingToType([1.0 - 3.0 * 0.1, 2.0 - 3.0 * 0.1],
var0.eval())
self.assertAllCloseAccordingToType([3.0 - 3.0 * 0.01, 4.0 - 3.0 * 0.01],
var1.eval())
self.assertAllCloseAccordingToType(1, global_step.eval())
gradient_descent_optimizer_v1_fn = NamedObject(
"GradientDescentV1", lambda: gradient_descent.GradientDescentOptimizer(0.2))
adagrad_optimizer_v1_fn = NamedObject(
"AdagradV1", lambda: adagrad.AdagradOptimizer(0.001))
adam_optimizer_v1_fn = NamedObject("AdamV1",
lambda: adam.AdamOptimizer(0.001, epsilon=1))
rmsprop_optimizer_v1_fn = NamedObject(
"RmsPropV1", lambda: rmsprop.RMSPropOptimizer(0.001))
optimizers_v1 = [gradient_descent_optimizer_v1_fn, adagrad_optimizer_v1_fn]
gradient_descent_optimizer_v2_fn = NamedObject(
"GradientDescentV2",
lambda: gradient_descent_v2.GradientDescentOptimizer(0.2))
adagrad_optimizer_v2_fn = NamedObject(
"AdagradV2", lambda: adagrad_v2.AdagradOptimizer(0.001))
adam_optimizer_v2_fn = NamedObject(
"AdamV2", lambda: adam_v2.AdamOptimizer(0.001, epsilon=1))
optimizers_v2 = [gradient_descent_optimizer_v2_fn, adagrad_optimizer_v2_fn]
graph_and_eager_modes = ["graph", "eager"]
def distributions_and_v1_optimizers():
"""A common set of combination with DistributionStrategies and Optimizers."""
return combine(
distribution=[
one_device_strategy,
