def parameter(input_var,
length,
initializer=tf.zeros_initializer(),
dtype=tf.float32,
trainable=True,
name="parameter"):
"""
Paramter function that creates variables that could be
broadcast to a certain shape to match with input var.
Args:
input_var: Input tf.Tensor.
length: Integer dimension of the variables.
initializer: Initializer of the variables.
dtype: Data type of the variables.
trainable: Whether these variables are trainable.
name: variable scope of the variables.
Return:
A tensor of broadcasted variables
"""
with tf.variable_scope(name):
p = tf.get_variable("parameter",
shape=(length, ),
dtype=dtype,
initializer=initializer,
trainable=trainable)
ndim = input_var.get_shape().ndims
broadcast_shape = tf.concat(
axis=0, values=[tf.shape(input_var)[:ndim - 1], [length]])
p_broadcast = broadcast_to(p, shape=broadcast_shape)
return p_broadcast
def testMatMulBroadcast(self):
with self.session() as sess:
with ops.device("/device:IPU:0"):
in0 = array_ops.placeholder(np.float16, shape=[1024])
in0_bcast = gen_array_ops.broadcast_to(in0, shape=[1024, 1024])
in1 = array_ops.placeholder(np.float16, shape=[1024, 1024])
with variable_scope.variable_scope("vs", use_resource=True):
weights = variable_scope.get_variable(
"x",
dtype=np.float16,
shape=[1024, 1024],
initializer=init_ops.constant_initializer(0.0))
mm1 = math_ops.matmul(in0_bcast, weights, name="mm1")
mm2 = math_ops.matmul(in1, mm1, name="mm2")
report = ReportJSON(self, sess)
tu.move_variable_initialization_to_cpu()
sess.run(variables.global_variables_initializer())
report.reset()
sess.run(mm2, {in0: np.zeros(in0.shape), in1: np.zeros(in1.shape)})
report.parse_log()
report.assert_total_tile_memory(112509300)
report.assert_max_tile_memory(100438)
ok = ['__seed*', 'host-exchange-local-copy-', 'mm1/dot*', 'Copy_']
report.assert_all_compute_sets_and_list(ok)
def model(device):
with ops.device(device):
x = array_ops.placeholder(np.float32, shape=[2])
x_bcast = gen_array_ops.broadcast_to(
x, shape=[2, 256, 256, 2])
w_bcast = gen_array_ops.broadcast_to(x, shape=[2, 2, 2, 2])
y = nn.conv2d(x_bcast,
w_bcast,
strides=1,
padding="SAME",
name="a")
y = nn.conv2d(y,
w_bcast,
strides=1,
padding="SAME",
name="b")
return sess.run(y, {x: np.ones(x.shape)})
def _get_one_input(data):
result = []
for i in range(len(shapes)):
result.append(
math_ops.cast(
gen_array_ops.broadcast_to(data, shape=shapes[i]),
dtype=dtypes[i]))
return result
def gru(name,
gru_cell,
all_input_var,
step_input_var,
step_hidden_var,
output_nonlinearity_layer,
hidden_state_init=tf.zeros_initializer(),
hidden_state_init_trainable=False):
"""
Gated Recurrent Unit (GRU).
Args:
name (str): Name of the variable scope.
gru_cell (tf.keras.layers.Layer): GRU cell used to generate
outputs.
all_input_var (tf.Tensor): Place holder for entire time-series inputs.
step_input_var (tf.Tensor): Place holder for step inputs.
step_hidden_var (tf.Tensor): Place holder for step hidden state.
output_nonlinearity (callable): Activation function for output dense
layer. It should return a tf.Tensor. Set it to None to
maintain a linear activation.
hidden_state_init (callable): Initializer function for the
initial hidden state. The functino should return a tf.Tensor.
hidden_state_init_trainable (bool): Bool for whether the initial
hidden state is trainable.
Return:
outputs (tf.Tensor): Entire time-series outputs.
output (tf.Tensor): Step output.
hidden (tf.Tensor): Step hidden state.
hidden_init_var (tf.Tensor): Initial hidden state.
"""
with tf.variable_scope(name):
hidden_dim = gru_cell.units
output, [hidden] = gru_cell(step_input_var, states=[step_hidden_var])
output = output_nonlinearity_layer(output)
hidden_init_var = tf.get_variable(
name='initial_hidden',
shape=(hidden_dim, ),
initializer=hidden_state_init,
trainable=hidden_state_init_trainable,
dtype=tf.float32)
hidden_init_var_b = broadcast_to(
hidden_init_var, shape=[tf.shape(all_input_var)[0], hidden_dim])
def step(hprev, x):
_, [h] = gru_cell(x, states=[hprev])
return h
shuffled_input = tf.transpose(all_input_var, (1, 0, 2))
hs = tf.scan(step, elems=shuffled_input, initializer=hidden_init_var_b)
hs = tf.transpose(hs, (1, 0, 2))
outputs = output_nonlinearity_layer(hs)
return outputs, output, hidden, hidden_init_var
def _createSimpleDataset(self, num_elems, tmp_dir=None):
if not tmp_dir:
tmp_dir = self._makeSnapshotDirectory()
dataset = dataset_ops.Dataset.from_tensor_slices([1.0])
dataset = dataset.map(
lambda x: gen_array_ops.broadcast_to(x, [50, 50, 3]))
dataset = dataset.repeat(num_elems)
dataset = dataset.apply(snapshot.snapshot(tmp_dir))
return dataset
def testSpecifyShardSize(self):
tmpdir = self.makeSnapshotDirectory()
dataset = dataset_ops.Dataset.from_tensor_slices([1.0])
dataset = dataset.map(lambda x: gen_array_ops.broadcast_to(x, [1024, 1024]))
dataset = dataset.repeat(10)
dataset = dataset.apply(
snapshot.snapshot(tmpdir, shard_size_bytes=10 * 1024 * 1024))
next_fn = self.getNext(dataset)
for _ in range(10):
self.evaluate(next_fn())
self.assertSnapshotDirectoryContains(tmpdir, 1, 1, 4)
def _createSimpleDataset(self,
num_elements,
tmp_dir=None,
compression=snapshot.COMPRESSION_NONE):
if not tmp_dir:
tmp_dir = self._makeSnapshotDirectory()
dataset = dataset_ops.Dataset.from_tensor_slices([1.0])
dataset = dataset.map(
lambda x: gen_array_ops.broadcast_to(x, [50, 50, 3]))
dataset = dataset.repeat(num_elements)
dataset = dataset.apply(
snapshot.legacy_snapshot(tmp_dir, compression=compression))
return dataset
def testSpecifyShardSize(self, compression):
tmpdir = self.snapshot_dir
dataset = dataset_ops.Dataset.from_tensor_slices([1.0])
dataset = dataset.map(lambda x: gen_array_ops.broadcast_to(x, [1024, 1024]))
dataset = dataset.repeat(10)
dataset = dataset.apply(
snapshot.snapshot(
tmpdir, shard_size_bytes=10 * 1024 * 1024, compression=compression))
next_fn = self.getNext(dataset)
for _ in range(10):
self.evaluate(next_fn())
num_files = 1
if compression == snapshot.COMPRESSION_NONE:
num_files = 3
self.assertSnapshotDirectoryContains(tmpdir, 1, 1, num_files)
def model(x, y, z):
scale = gen_array_ops.broadcast_to(z, shape=[65536])
offset = scale
b_mean, b_var = nn.moments(x, [0, 1, 2], name='moments')
a = nn.fused_batch_norm(x,
scale,
offset,
b_mean,
b_var,
1e-3,
is_training=False,
name="a")
b = nn.fused_batch_norm(y,
scale,
offset,
b_mean,
b_var,
1e-3,
is_training=False,
name="b")
return a[0] + b[0]
def parameter(input_var,
length,
initializer=tf.zeros_initializer(),
dtype=tf.float32,
trainable=True,
name='parameter'):
"""
Parameter layer.
Used as layer that could be broadcast to a certain shape to
match with input variable during training.
Example: A trainable parameter variable with shape (2,), it needs to be
broadcasted to (32, 2) when applied to a batch with size 32.
Args:
input_var (tf.Tensor): Input tf.Tensor.
length (int): Integer dimension of the variables.
initializer (callable): Initializer of the variables. The function
should return a tf.Tensor.
dtype: Data type of the variables (default is tf.float32).
trainable (bool): Whether these variables are trainable.
name (str): Variable scope of the variables.
Return:
A tensor of the broadcasted variables.
"""
with tf.variable_scope(name):
p = tf.get_variable(
'parameter',
shape=(length, ),
dtype=dtype,
initializer=initializer,
trainable=trainable)
broadcast_shape = tf.concat(
axis=0, values=[tf.shape(input_var)[:-1], [length]])
p_broadcast = broadcast_to(p, shape=broadcast_shape)
return p_broadcast
def parameter(input_var,
length,
initializer=tf.zeros_initializer(),
dtype=tf.float32,
trainable=True,
name="parameter"):
"""
Parameter layer.
Used as layer that could be broadcast to a certain shape to
match with input variable during training.
Example: A trainable parameter variable with shape (2,), it needs to be
broadcasted to (32, 2) when applied to a batch with size 32.
Args:
input_var: Input tf.Tensor.
length: Integer dimension of the variables.
initializer: Initializer of the variables.
dtype: Data type of the variables.
trainable: Whether these variables are trainable.
name: variable scope of the variables.
Return:
A tensor of the broadcasted variables.
"""
with tf.variable_scope(name):
p = tf.get_variable("parameter",
shape=(length, ),
dtype=dtype,
initializer=initializer,
trainable=trainable)
ndim = input_var.get_shape().ndims
broadcast_shape = tf.concat(
axis=0, values=[tf.shape(input_var)[:ndim - 1], [length]])
p_broadcast = broadcast_to(p, shape=broadcast_shape)
return p_broadcast
def func(x):
y_const = constant_op.constant([1., 2., 3.])
y_broadcast = gen_array_ops.broadcast_to(y_const, [3, 3])
return math_ops.matmul(x, y_broadcast)
def lstm(name,
lstm_cell,
all_input_var,
step_input_var,
step_hidden_var,
step_cell_var,
output_nonlinearity_layer,
hidden_state_init=tf.zeros_initializer(),
hidden_state_init_trainable=False,
cell_state_init=tf.zeros_initializer(),
cell_state_init_trainable=False):
"""
Long Short-Term Memory (LSTM).
Args:
name (str): Name of the variable scope.
lstm_cell (tf.keras.layers.Layer): LSTM cell used to generate
outputs.
all_input_var (tf.Tensor): Place holder for entire time-seried inputs.
step_input_var (tf.Tensor): Place holder for step inputs.
step_hidden_var (tf.Tensor): Place holder for step hidden state.
step_cell_var (tf.Tensor): Place holder for cell state.
output_nonlinearity (callable): Activation function for output dense
layer. It should return a tf.Tensor. Set it to None to
maintain a linear activation.
hidden_state_init (callable): Initializer function for the
initial hidden state. The functino should return a tf.Tensor.
hidden_state_init_trainable (bool): Bool for whether the initial
hidden state is trainable.
cell_state_init (callable): Initializer function for the
initial cell state. The functino should return a tf.Tensor.
cell_state_init_trainable (bool): Bool for whether the initial
cell state is trainable.
Return:
outputs (tf.Tensor): Entire time-seried outputs.
output (tf.Tensor): Step output.
hidden (tf.Tensor): Step hidden state.
cell (tf.Tensor): Step cell state.
hidden_init_var (tf.Tensor): Initial hidden state.
cell_init_var (tf.Tensor): Initial cell state.
"""
with tf.variable_scope(name):
hidden_dim = lstm_cell.units
output, [hidden,
cell] = lstm_cell(step_input_var,
states=(step_hidden_var, step_cell_var))
output = output_nonlinearity_layer(output)
hidden_init_var = tf.get_variable(
name='initial_hidden',
shape=(hidden_dim, ),
initializer=hidden_state_init,
trainable=hidden_state_init_trainable,
dtype=tf.float32)
cell_init_var = tf.get_variable(name='initial_cell',
shape=(hidden_dim, ),
initializer=cell_state_init,
trainable=cell_state_init_trainable,
dtype=tf.float32)
hidden_init_var_b = broadcast_to(
hidden_init_var, shape=[tf.shape(all_input_var)[0], hidden_dim])
cell_init_var_b = broadcast_to(
cell_init_var, shape=[tf.shape(all_input_var)[0], hidden_dim])
def step(hcprev, x):
hprev = hcprev[:, :hidden_dim]
cprev = hcprev[:, hidden_dim:]
h, c = lstm_cell(x, states=(hprev, cprev))[1]
return tf.concat(axis=1, values=[h, c])
shuffled_input = tf.transpose(all_input_var, (1, 0, 2))
hcs = tf.scan(
step,
elems=shuffled_input,
initializer=tf.concat(axis=1,
values=[hidden_init_var_b, cell_init_var_b]),
)
hcs = tf.transpose(hcs, (1, 0, 2))
hs = hcs[:, :, :hidden_dim]
outputs = output_nonlinearity_layer(hs)
return outputs, output, hidden, cell, hidden_init_var, cell_init_var
def repeat_with_axis(data, repeats, axis, name=None):
"""Repeats elements of `data`.
Args:
data: An `N`-dimensional tensor.
repeats: A 1-D integer tensor specifying how many times each element in
`axis` should be repeated. `len(repeats)` must equal `data.shape[axis]`.
Supports broadcasting from a scalar value.
axis: `int`. The axis along which to repeat values. Must be less than
`max(N, 1)`.
name: A name for the operation.
Returns:
A tensor with `max(N, 1)` dimensions. Has the same shape as `data`,
except that dimension `axis` has size `sum(repeats)`.
Example usage:
>>> repeat(['a', 'b', 'c'], repeats=[3, 0, 2], axis=0)
<tf.Tensor: shape=(5,), dtype=string,
numpy=array([b'a', b'a', b'a', b'c', b'c'], dtype=object)>
>>> repeat([[1, 2], [3, 4]], repeats=[2, 3], axis=0)
<tf.Tensor: shape=(5, 2), dtype=int32, numpy=
array([[1, 2],
[1, 2],
[3, 4],
[3, 4],
[3, 4]], dtype=int32)>
>>> repeat([[1, 2], [3, 4]], repeats=[2, 3], axis=1)
<tf.Tensor: shape=(2, 5), dtype=int32, numpy=
array([[1, 1, 2, 2, 2],
[3, 3, 4, 4, 4]], dtype=int32)>
"""
if not isinstance(axis, int):
raise TypeError("axis must be an int; got %s" % type(axis).__name__)
with ops.name_scope(name, "Repeat", [data, repeats]):
data = ops.convert_to_tensor(data, name="data")
repeats = tf.cast(repeats, tf.int32)
# repeats = tile_one_dimension.convert_to_int_tensor(repeats, name="repeats")
repeats.shape.with_rank_at_most(1)
# If `data` is a scalar, then upgrade it to a vector.
data = _with_nonzero_rank(data)
data_shape = array_ops.shape(data)
# If `axis` is negative, then convert it to a positive value.
axis = get_positive_axis(axis, len(data.shape.as_list()), ndims_name="rank(data)")
# Check data Tensor shapes.
if repeats.shape.ndims == 1:
data.shape.dims[axis].assert_is_compatible_with(repeats.shape[0])
# If we know that `repeats` is a scalar, then we can just tile & reshape.
if repeats.shape.ndims == 0:
expanded = array_ops.expand_dims(data, axis + 1)
tiled = tile_one_dimension(expanded, axis + 1, repeats)
result_shape = array_ops.concat([data_shape[:axis], [-1], data_shape[axis + 1:]],
axis=0)
return array_ops.reshape(tiled, result_shape)
# Broadcast the `repeats` tensor so rank(repeats) == axis + 1.
if repeats.shape.ndims != axis + 1:
repeats_shape = array_ops.shape(repeats)
repeats_ndims = rank(repeats)
broadcast_shape = array_ops.concat(
[data_shape[:axis + 1 - repeats_ndims], repeats_shape], axis=0)
repeats = gen_array_ops.broadcast_to(repeats, broadcast_shape)
repeats.set_shape([None] * (axis + 1))
# Create a "sequence mask" based on `repeats`, where slices across `axis`
# contain one `True` value for each repetition. E.g., if
# `repeats = [3, 1, 2]`, then `mask = [[1, 1, 1], [1, 0, 0], [1, 1, 0]]`.
max_repeat = gen_math_ops.maximum(
0, gen_math_ops._max(repeats, _all_dimensions(repeats)))
mask = array_ops.sequence_mask(repeats, max_repeat)
# Add a new dimension around each value that needs to be repeated, and
# then tile that new dimension to match the maximum number of repetitions.
expanded = array_ops.expand_dims(data, axis + 1)
tiled = tile_one_dimension(expanded, axis + 1, max_repeat)
# Use `boolean_mask` to discard the extra repeated values. This also
# flattens all dimensions up through `axis`.
masked = array_ops.boolean_mask(tiled, mask)
# Reshape the output tensor to add the outer dimensions back.
if axis == 0:
result = masked
else:
result_shape = array_ops.concat([data_shape[:axis], [-1], data_shape[axis + 1:]],
axis=0)
result = array_ops.reshape(masked, result_shape)
# Preserve shape information.
if data.shape.ndims is not None:
new_axis_size = 0 if repeats.shape[0] == 0 else None
result.set_shape(data.shape[:axis].concatenate(
[new_axis_size]).concatenate(data.shape[axis + 1:]))
return result
def func(x): y_const = constant_op.constant([1., 2., 3.]) y_broadcast = gen_array_ops.broadcast_to(y_const, [3, 3]) return math_ops.matmul(x, y_broadcast)
