def _testDense(self,
use_resource=False,
learning_rate=0.1,
sign_decay_fn=None,
py_sign_decay_fn=None,
base=math.e,
beta=0.9):
for dtype in [dtypes.half, dtypes.float32, dtypes.float64]:
with self.test_session(use_gpu=True):
# Initialize variables for numpy implementation.
m0, m1 = 0.0, 0.0
var0_np = np.array([1.0, 2.0], dtype=dtype.as_numpy_dtype)
grads0_np = np.array([0.1, 0.1], dtype=dtype.as_numpy_dtype)
var1_np = np.array([3.0, 4.0], dtype=dtype.as_numpy_dtype)
grads1_np = np.array([0.01, 0.01], dtype=dtype.as_numpy_dtype)
if use_resource:
var0 = resource_variable_ops.ResourceVariable(var0_np)
var1 = resource_variable_ops.ResourceVariable(var1_np)
global_step = resource_variable_ops.ResourceVariable(
0, trainable=False)
else:
var0 = variables.VariableV1(var0_np)
var1 = variables.VariableV1(var1_np)
global_step = variables.VariableV1(0, trainable=False)
grads0 = constant_op.constant(grads0_np)
grads1 = constant_op.constant(grads1_np)
opt = powersign.PowerSignOptimizer(
learning_rate=learning_rate,
base=base,
beta=beta,
sign_decay_fn=sign_decay_fn,
)
update = opt.apply_gradients(zip([grads0, grads1],
[var0, var1]),
global_step=global_step)
neg_update = opt.apply_gradients(zip([-grads0, -grads1],
[var0, var1]),
global_step=global_step)
if not context.executing_eagerly():
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 7 steps of powersign
# first 4 steps with positive gradient
# last 3 steps with negative gradient (sign(gm) should be -1)
for t in range(1, 8):
if t < 5:
if not context.executing_eagerly():
self.evaluate(update)
elif t > 1:
opt.apply_gradients(zip([grads0, grads1],
[var0, var1]),
global_step=global_step)
else:
if not context.executing_eagerly():
self.evaluate(neg_update)
elif t > 1:
opt.apply_gradients(zip([-grads0, -grads1],
[var0, var1]),
global_step=global_step)
var0_np, m0 = powersign_update_numpy(
var0_np,
grads0_np if t < 5 else -grads0_np,
m0,
learning_rate,
base=base,
beta=beta,
py_sign_decay_fn=py_sign_decay_fn,
t=t,
)
var1_np, m1 = powersign_update_numpy(
var1_np,
grads1_np if t < 5 else -grads1_np,
m1,
learning_rate,
base=base,
beta=beta,
py_sign_decay_fn=py_sign_decay_fn,
t=t,
)
# Validate updated params
self.assertAllCloseAccordingToType(var0_np,
self.evaluate(var0))
self.assertAllCloseAccordingToType(var1_np,
self.evaluate(var1))
def _testDense(self,
learning_rate=0.1,
sign_decay_fn=None,
py_sign_decay_fn=None,
base=math.e,
beta=0.9):
for dtype in self.float_types:
with self.cached_session(), self.test_scope():
# Initialize variables for numpy implementation.
m0, m1 = 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)
global_step = resource_variable_ops.ResourceVariable(0, trainable=False)
grads0 = constant_op.constant(grads0_np)
grads1 = constant_op.constant(grads1_np)
opt = powersign.PowerSignOptimizer(
learning_rate=learning_rate,
base=base,
beta=beta,
sign_decay_fn=sign_decay_fn,
)
update = opt.apply_gradients(zip([grads0, grads1], [var0, var1]),
global_step=global_step)
neg_update = opt.apply_gradients(zip([-grads0, -grads1], [var0, var1]),
global_step=global_step)
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 7 steps of powersign
# first 4 steps with positive gradient
# last 3 steps with negative gradient (sign(gm) should be -1)
for t in range(1, 8):
if t < 5:
update.run()
else:
neg_update.run()
var0_np, m0 = powersign_update_numpy(
var0_np,
grads0_np if t < 5 else -grads0_np,
m0,
learning_rate,
base=base,
beta=beta,
py_sign_decay_fn=py_sign_decay_fn,
t=t,
)
var1_np, m1 = powersign_update_numpy(
var1_np,
grads1_np if t < 5 else -grads1_np,
m1,
learning_rate,
base=base,
beta=beta,
py_sign_decay_fn=py_sign_decay_fn,
t=t,
)
# Validate updated params
self.assertAllCloseAccordingToType(var0_np, var0.eval())
self.assertAllCloseAccordingToType(var1_np, var1.eval())
