def partition(comp_arrow: CompositeArrow) -> List[Set[Arrow]]:
"""Partitions the comp_arrow into sequential layers of its sub_arrows"""
partition_arrows = []
arrow_colors = pqdict()
for sub_arrow in comp_arrow.get_sub_arrows():
arrow_colors[sub_arrow] = sub_arrow.num_in_ports()
for port in comp_arrow.in_ports():
in_ports = comp_arrow.neigh_in_ports(port)
for in_port in in_ports:
assert in_port.arrow in arrow_colors, "sub_arrow not in arrow_colors"
arrow_colors[in_port.arrow] -= 1
while len(arrow_colors) > 0:
arrow_layer = set()
view_arrow, view_priority = arrow_colors.topitem()
while view_priority == 0:
sub_arrow, priority = arrow_colors.popitem()
arrow_layer.add(sub_arrow)
if len(arrow_colors) == 0:
break
view_arrow, view_priority = arrow_colors.topitem()
partition_arrows.append(arrow_layer)
for arrow in arrow_layer:
for out_port in arrow.out_ports():
in_ports = comp_arrow.neigh_in_ports(out_port)
for in_port in in_ports:
if in_port.arrow != comp_arrow:
assert in_port.arrow in arrow_colors, "sub_arrow not in arrow_colors"
arrow_colors[in_port.arrow] -= 1
return partition_arrows
def invert(comp_arrow: CompositeArrow,
dispatch: Dict[Arrow, Callable] = default_dispatch) -> Arrow:
"""Construct a parametric inverse of comp_arrow
Args:
comp_arrow: Arrow to invert
dispatch: Dict mapping comp_arrow class to invert function
Returns:
A (approximate) parametric inverse of `comp_arrow`"""
# Replace multiedges with dupls and propagate
comp_arrow.duplify()
port_attr = propagate(comp_arrow)
return inner_invert(comp_arrow, port_attr, dispatch)[0]
def conv(a: CompositeArrow, args: TensorVarList, state) -> Sequence[Tensor]:
assert len(args) == a.num_in_ports()
with tf.name_scope(a.name):
# import pdb; pdb.set_trace()
# FIXME: A horrible horrible hack
port_grab = state['port_grab']
return interpret(conv, a, args, state, port_grab)
def gen_arrow_inputs(comp_arrow: CompositeArrow, inputs: List, arrow_colors):
# Store a map from an arrow to its inputs
# Use a dict because no guarantee we'll create input tensors in order
arrow_inputs = dict() # type: Dict[Arrow, MutableMapping[int, Any]]
for sub_arrow in comp_arrow.get_all_arrows():
arrow_inputs[sub_arrow] = dict()
# Decrement priority of every arrow connected to the input
for i, input_value in enumerate(inputs):
for in_port in comp_arrow.edges[comp_arrow.in_ports()[i]]:
# in_port = comp_arrow.inner_in_ports()[i]
sub_arrow = in_port.arrow
arrow_colors[sub_arrow] = arrow_colors[sub_arrow] - 1
arrow_inputs[sub_arrow][in_port.index] = input_value
return arrow_inputs
def filter_arrows(fil, arrow: CompositeArrow, deep=True):
good_arrows = set()
for sub_arrow in arrow.get_sub_arrows():
if fil(sub_arrow):
good_arrows.add(sub_arrow)
if deep and isinstance(sub_arrow, CompositeArrow):
for sub_sub_arrow in filter_arrows(fil, sub_arrow, deep=deep):
good_arrows.add(sub_sub_arrow)
return good_arrows
def gen_arrow_colors(comp_arrow: CompositeArrow):
"""
Interpret a composite arrow on some inputs
Args:
comp_arrow: Composite Arrow
Returns:
arrow_colors: Priority Queue of arrows
"""
# priority is the number of inputs each arrrow has which have been 'seen'
# seen inputs are inputs to the composition, or outputs of arrows that
# have already been converted into
arrow_colors = pqdict() # type: MutableMapping[Arrow, int]
for sub_arrow in comp_arrow.get_sub_arrows():
arrow_colors[sub_arrow] = sub_arrow.num_in_ports()
# TODO: Unify
arrow_colors[comp_arrow] = comp_arrow.num_out_ports()
return arrow_colors
def inner_interpret(conv: Callable, comp_arrow: CompositeArrow, inputs: List,
arrow_colors: MutableMapping[Arrow, int],
arrow_inputs: Sequence, state: Dict, port_grab: Dict[Port,
Any]):
"""Convert an comp_arrow to a tensorflow graph and add to graph"""
assert len(inputs) == comp_arrow.num_in_ports(), "wrong # inputs"
emit_list = []
while len(arrow_colors) > 0:
# print_arrow_colors(arrow_colors)
# print("Converting ", sub_arrow.name)
sub_arrow, priority = arrow_colors.popitem()
if sub_arrow is not comp_arrow:
assert priority == 0, "Must resolve {} more inputs to {} first".format(
priority, sub_arrow)
# inputs = [arrow_inputs[sub_arrow][i] for i in range(len(arrow_inputs[sub_arrow]))]
inputs = [
arrow_inputs[sub_arrow][i]
for i in sorted(arrow_inputs[sub_arrow].keys())
]
outputs = conv(sub_arrow, inputs, state)
assert len(outputs) == len(
sub_arrow.out_ports()), "diff num outputs"
# Decrement the priority of each subarrow connected to this arrow
# Unless of course it is connected to the outside word
for i, out_port in enumerate(sub_arrow.out_ports()):
neigh_in_ports = comp_arrow.neigh_in_ports(out_port)
for neigh_in_port in neigh_in_ports:
neigh_arrow = neigh_in_port.arrow
arrow_colors[neigh_arrow] = arrow_colors[neigh_arrow] - 1
arrow_inputs[neigh_arrow][neigh_in_port.index] = outputs[i]
# Extract some port, kind of a hack
for port in port_grab:
if port.arrow in arrow_inputs:
if port.index in arrow_inputs[port.arrow]:
port_grab[port] = arrow_inputs[port.arrow][port.index]
outputs_dict = arrow_inputs[comp_arrow]
out_port_indices = sorted(list(outputs_dict.keys()))
return [outputs_dict[i] for i in out_port_indices]
def propagate(comp_arrow: CompositeArrow,
port_attr: PortAttributes=None,
state=None,
already_prop=None,
only_prop=None) -> PortAttributes:
"""
Propagate values around a composite arrow to determine knowns from unknowns
The knowns should be determined by the knowns, otherwise an error throws
Args:
sub_propagate: an @overloaded function which propagates from each arrow
sub_propagate(a: ArrowType, port_to_known:Dict[Port, T], state:Any)
comp_arrow: Composite Arrow to propagate through
port_attr: port->value map for inputs to composite arrow
state: A value of any type that is passed around during propagation
and can be updated by sub_propagate
Returns:
port->value map for all ports in composite arrow
"""
already_prop = set() if already_prop is None else already_prop
print("Propagating")
# Copy port_attr to avoid affecting input
port_attr = {} if port_attr is None else port_attr
_port_attr = defaultdict(lambda: dict())
for port, attr in port_attr.items():
for attr_key, attr_value in attr.items():
_port_attr[port][attr_key] = attr_value
# if comp_arrow.parent is None:
# comp_arrow.toposort()
# update port_attr with values stored on port
extract_port_attr(comp_arrow, _port_attr)
updated = set(comp_arrow.get_sub_arrows_nested())
update_neigh(_port_attr, _port_attr, comp_arrow, comp_arrow, only_prop, updated)
while len(updated) > 0:
# print(len(updated), " arrows updating in proapgation iteration")
sub_arrow = updated.pop()
sub_port_attr = {port: _port_attr[port]
for port in sub_arrow.ports()
if port in _port_attr}
pred_dispatches = sub_arrow.get_dispatches()
for pred, dispatch in pred_dispatches.items():
if pred(sub_arrow, sub_port_attr) and (sub_arrow, dispatch) not in already_prop:
new_sub_port_attr = dispatch(sub_arrow, sub_port_attr)
update_neigh(new_sub_port_attr, _port_attr, sub_arrow.parent, comp_arrow, only_prop, updated)
already_prop.add((sub_arrow, dispatch))
if isinstance(sub_arrow, CompositeArrow):
# new_sub_port_attr = propagate(sub_arrow, sub_port_attr, state, already_prop)
# update_neigh(new_sub_port_attr, _port_attr, comp_arrow, updated)
update_neigh(sub_port_attr, _port_attr, sub_arrow, comp_arrow, only_prop, updated)
update_neigh(sub_port_attr, _port_attr, sub_arrow.parent, comp_arrow, only_prop, updated)
print("Done Propagating")
return _port_attr
def eliminate(arrow: CompositeArrow):
"""Eliminates redundant parameter
Args:
a: Parametric Arrow prime for eliminate!
Returns:
New Parameteric Arrow with fewer parameters"""
# Warning: This is a huge hack
# Get the shapes of param ports
port_attr = propagate(arrow)
symbt_ports = {}
for port in arrow.in_ports():
if is_param_port(port):
shape = get_port_shape(port, port_attr)
symbt_ports[port] = {}
# Create a symbolic tensor for each param port
st = SymbolicTensor(shape=shape,
name="port%s" % port.index,
port=port)
symbt_ports[port]['symbolic_tensor'] = st
# repropagate
port_attr = propagate(arrow, symbt_ports)
# as a hack, just look on ports of duples to find symbolic tensors which
# should be equivalent
dupls = filter_arrows(lambda a: a.name in dupl_names, arrow)
dupl_to_equiv = {}
# Not all ports contain ports with symbolic tensor constraints
valid_ports = set()
for dupl in dupls:
equiv = []
for p in dupl.ports():
if 'symbolic_tensor' in port_attr[p]:
valid_ports.add(port_attr[p]['symbolic_tensor'].port)
equiv.append(port_attr[p]['symbolic_tensor'])
dupl_to_equiv[dupl] = equiv
equiv_thetas = find_equivalent_thetas(dupl_to_equiv)
return create_arrow(arrow, equiv_thetas, port_attr, valid_ports,
symbt_ports)
def gen_data(lmbda: float, size: int):
forward_arrow = CompositeArrow(name="forward")
in_port1 = forward_arrow.add_port()
make_in_port(in_port1)
in_port2 = forward_arrow.add_port()
make_in_port(in_port2)
out_port = forward_arrow.add_port()
make_out_port(out_port)
subtraction = SubArrow()
absolute = AbsArrow()
forward_arrow.add_edge(in_port1, subtraction.in_ports()[0])
forward_arrow.add_edge(in_port2, subtraction.in_ports()[1])
forward_arrow.add_edge(subtraction.out_ports()[0], absolute.in_ports()[0])
forward_arrow.add_edge(absolute.out_ports()[0], out_port)
assert forward_arrow.is_wired_correctly()
inverse_arrow = CompositeArrow(name="inverse")
in_port = inverse_arrow.add_port()
make_in_port(in_port)
param_port_1 = inverse_arrow.add_port()
make_in_port(param_port_1)
make_param_port(param_port_1)
param_port_2 = inverse_arrow.add_port()
make_in_port(param_port_2)
make_param_port(param_port_2)
out_port_1 = inverse_arrow.add_port()
make_out_port(out_port_1)
out_port_2 = inverse_arrow.add_port()
make_out_port(out_port_2)
inv_sub = InvSubArrow()
inv_abs = InvAbsArrow()
inverse_arrow.add_edge(in_port, inv_abs.in_ports()[0])
inverse_arrow.add_edge(param_port_1, inv_abs.in_ports()[1])
inverse_arrow.add_edge(inv_abs.out_ports()[0], inv_sub.in_ports()[0])
inverse_arrow.add_edge(param_port_2, inv_sub.in_ports()[1])
inverse_arrow.add_edge(inv_sub.out_ports()[0], out_port_1)
inverse_arrow.add_edge(inv_sub.out_ports()[1], out_port_2)
assert inverse_arrow.is_wired_correctly()
eps = 1e-5
data = []
dist = ExponentialRV(lmbda)
for _ in range(size):
x = tuple(dist.sample(shape=[2]))
y = np.abs(x[0] - x[1])
theta = (np.sign(x[0] - x[1]), x[1])
y_ = apply(forward_arrow, list(x))
x_ = apply(inverse_arrow, [y, theta[0], theta[1]])
assert np.abs(y_[0] - y) < eps
assert np.abs(x_[0] - x[0]) < eps
assert np.abs(x_[1] - x[1]) < eps
data.append((x, theta, y))
return data, forward_arrow, inverse_arrow
def inner_invert(comp_arrow: CompositeArrow, port_attr: PortAttributes,
dispatch: Dict[Arrow, Callable]):
"""Construct a parametric inverse of arrow
Args:
arrow: Arrow to invert
dispatch: Dict mapping arrow class to invert function
Returns:
A (approximate) parametric inverse of `arrow`
The ith in_port of comp_arrow will be corresponding ith out_port
error_ports and param_ports will follow"""
# Empty compositon for inverse
inv_comp_arrow = CompositeArrow(name="%s_inv" % comp_arrow.name)
# import pdb; pdb.set_trace()
# Add a port on inverse arrow for every port on arrow
for port in comp_arrow.ports():
inv_port = inv_comp_arrow.add_port()
if is_in_port(port):
if is_constant(port, port_attr):
make_in_port(inv_port)
else:
make_out_port(inv_port)
elif is_out_port(port):
if is_constant(port, port_attr):
make_out_port(inv_port)
else:
make_in_port(inv_port)
# Transfer port information
# FIXME: What port_attr go transfered from port to inv_port
if 'shape' not in port_attr[port]:
print('WARNING: shape unknown for %s' % port)
else:
set_port_shape(inv_port, get_port_shape(port, port_attr))
# invert each sub_arrow
arrow_to_inv = dict()
arrow_to_port_map = dict()
for sub_arrow in comp_arrow.get_sub_arrows():
inv_sub_arrow, port_map = invert_sub_arrow(sub_arrow, port_attr,
dispatch)
assert sub_arrow is not None
assert inv_sub_arrow.parent is None
arrow_to_port_map[sub_arrow] = port_map
arrow_to_inv[sub_arrow] = inv_sub_arrow
# Add comp_arrow to inv
assert comp_arrow is not None
arrow_to_inv[comp_arrow] = inv_comp_arrow
comp_port_map = {i: i for i in range(comp_arrow.num_ports())}
arrow_to_port_map[comp_arrow] = comp_port_map
# Then, rewire up all the edges
for out_port, in_port in comp_arrow.edges.items():
left_inv_port = get_inv_port(out_port, arrow_to_port_map, arrow_to_inv)
right_inv_port = get_inv_port(in_port, arrow_to_port_map, arrow_to_inv)
both = [left_inv_port, right_inv_port]
projecting = list(
filter(lambda x: would_project(x, inv_comp_arrow), both))
receiving = list(
filter(lambda x: would_receive(x, inv_comp_arrow), both))
assert len(projecting) == 1, "Should be only 1 projecting"
assert len(receiving) == 1, "Should be only 1 receiving"
inv_comp_arrow.add_edge(projecting[0], receiving[0])
for transform in transforms:
transform(inv_comp_arrow)
# Craete new ports on inverse compositions for parametric and error ports
for sub_arrow in inv_comp_arrow.get_sub_arrows():
for port in sub_arrow.ports():
if is_param_port(port):
assert port not in inv_comp_arrow.edges.keys()
assert port not in inv_comp_arrow.edges.values()
param_port = inv_comp_arrow.add_port()
inv_comp_arrow.add_edge(param_port, port)
make_in_port(param_port)
make_param_port(param_port)
elif is_error_port(port):
assert port not in inv_comp_arrow.edges.keys()
assert port not in inv_comp_arrow.edges.values()
error_port = inv_comp_arrow.add_port()
inv_comp_arrow.add_edge(port, error_port)
make_out_port(error_port)
make_error_port(error_port)
return inv_comp_arrow, comp_port_map
def reparam(comp_arrow: CompositeArrow,
phi_shape: Tuple,
nn_takes_input=True):
"""Reparameterize an arrow. All parametric inputs now function of phi
Args:
comp_arrow: Arrow to reparameterize
phi_shape: Shape of parameter input
"""
reparam = CompositeArrow(name="%s_reparam" % comp_arrow.name)
phi = reparam.add_port()
set_port_shape(phi, phi_shape)
make_in_port(phi)
make_param_port(phi)
n_in_ports = 1
if nn_takes_input:
n_in_ports += comp_arrow.num_in_ports() - comp_arrow.num_param_ports()
nn = TfArrow(n_in_ports=n_in_ports, n_out_ports=comp_arrow.num_param_ports())
reparam.add_edge(phi, nn.in_port(0))
i = 0
j = 1
for port in comp_arrow.ports():
if is_param_port(port):
reparam.add_edge(nn.out_port(i), port)
i += 1
else:
re_port = reparam.add_port()
if is_out_port(port):
make_out_port(re_port)
reparam.add_edge(port, re_port)
if is_in_port(port):
make_in_port(re_port)
reparam.add_edge(re_port, port)
if nn_takes_input:
reparam.add_edge(re_port, nn.in_port(j))
j += 1
if is_error_port(port):
make_error_port(re_port)
for label in get_port_labels(port):
add_port_label(re_port, label)
assert reparam.is_wired_correctly()
return reparam
def g_from_g_theta(inv: Arrow, g_theta: Arrow):
"""
Construct an amoritzed random variable g from a parametric inverse `inv`
and function `g_theta` which constructs parameters for `inv`
Args:
g_theta: Y x Y ... Y x Z -> Theta
Returns:
Y x Y x .. x Z -> X x ... X x Error x ... Error
"""
c = CompositeArrow(name="%s_g_theta" % inv.name)
inv_in_ports, inv_param_ports, inv_out_ports, inv_error_ports = split_ports(
inv)
g_theta_in_ports, g_theta_param_ports, g_theta_out_ports, g_theta_error_ports = split_ports(
g_theta)
assert len(g_theta_out_ports) == len(inv_param_ports)
# Connect y to g_theta and f
for i in range(len(inv_in_ports)):
y_in_port = c.add_port()
make_in_port(y_in_port)
c.add_edge(y_in_port, g_theta.in_port(i))
c.add_edge(y_in_port, inv_in_ports[i])
# conect up noise input to g_theta
z_in_port = c.add_port()
make_in_port(z_in_port)
c.add_edge(z_in_port, g_theta.in_port(len(inv_in_ports)))
# connect g_theta to inv
for i in range(len(g_theta_out_ports)):
c.add_edge(g_theta.out_port(i), inv_param_ports[i])
for inv_out_port in inv_out_ports:
out_port = c.add_port()
make_out_port(out_port)
c.add_edge(inv_out_port, out_port)
for inv_error_port in inv_error_ports:
error_port = c.add_port()
make_out_port(error_port)
make_error_port(error_port)
c.add_edge(inv_error_port, error_port)
assert c.is_wired_correctly()
return c
def ConcatShuffleArrow(n_inputs: int, ndims: int):
"""Concatenate n_inputs inputs and shuffle
Arrow first n_inputs inputs are arrays to shuffle
last input is permutation vector
Args:
n_inputs"""
c = CompositeArrow(name="ConcatShuffle")
stack = StackArrow(n_inputs, axis=0)
for i in range(n_inputs):
in_port = c.add_port()
make_in_port(in_port)
c.add_edge(in_port, stack.in_port(i))
# Permutation vector
perm = c.add_port()
make_in_port(perm)
set_port_dtype(perm, 'int32')
gather = GatherArrow()
c.add_edge(stack.out_port(0), gather.in_port(0))
c.add_edge(perm, gather.in_port(1))
# Switch the first and last dimension
# FIXME: I do this only because gather seems to affect only first dimension
# There's a better way, probably using gather_nd
a = [i for i in range(ndims + 1)]
tp_perm = [a[i + 1] for i in range(len(a) - 1)] + [a[0]]
transpose = TransposeArrow(tp_perm)
c.add_edge(gather.out_port(0), transpose.in_port(0))
out = c.add_port()
make_out_port(out)
c.add_edge(transpose.out_port(0), out)
assert c.is_wired_correctly()
return c
def set_gan_arrow(arrow: Arrow,
cond_gen: Arrow,
disc: Arrow,
n_fake_samples: int,
ndims: int,
x_shapes=None,
z_shape=None) -> CompositeArrow:
"""
Arrow wihch computes loss for amortized random variable using set gan.
Args:
arrow: Forward function
cond_gen: Y x Z -> X - Conditional Generators
disc: X^n -> {0,1}^n
n_fake_samples: n, number of samples seen by discriminator at once
ndims: dimensionality of dims
Returns:
CompositeArrow: X x Z x ... Z x RAND_PERM -> d_Loss x g_Loss x Y x ... Y
"""
# TODO: Assumes that f has single in_port and single out_port, generalize
c = CompositeArrow(name="%s_set_gan" % arrow.name)
assert cond_gen.num_in_ports(
) == 2, "don't handle case of more than one Y input"
cond_gens = [deepcopy(cond_gen) for i in range(n_fake_samples)]
comp_in_ports = []
# Connect x to arrow in puts
for i in range(arrow.num_in_ports()):
in_port = c.add_port()
make_in_port(in_port)
comp_in_ports.append(in_port)
c.add_edge(in_port, arrow.in_port(i))
if x_shapes is not None:
set_port_shape(in_port, x_shapes[i])
# Connect f(x) to generator
for i in range(n_fake_samples):
for j in range(arrow.num_out_ports()):
c.add_edge(arrow.out_port(j), cond_gens[i].in_port(j))
# Connect noise input to generator second inport
for i in range(n_fake_samples):
noise_in_port = c.add_port()
make_in_port(noise_in_port)
if z_shape is not None:
set_port_shape(noise_in_port, z_shape)
cg_noise_in_port_id = cond_gens[i].num_in_ports() - 1
c.add_edge(noise_in_port, cond_gens[i].in_port(cg_noise_in_port_id))
stack_shuffles = []
rand_perm_in_port = c.add_port()
make_in_port(rand_perm_in_port)
set_port_shape(rand_perm_in_port, (n_fake_samples + 1, ))
set_port_dtype(rand_perm_in_port, 'int32')
# For every output of g, i.e. x and y if f(x, y) = z
# Stack all the Xs from the differet samples together and shuffle
cond_gen_non_error_out_ports = cond_gen.num_out_ports(
) - cond_gen.num_error_ports()
for i in range(cond_gen_non_error_out_ports):
stack_shuffle = ConcatShuffleArrow(n_fake_samples + 1, ndims)
stack_shuffles.append(stack_shuffle)
# Add each output from generator to shuffle set
for j in range(n_fake_samples):
c.add_edge(cond_gens[j].out_port(i), stack_shuffle.in_port(j))
# Add the posterior sample x to the shuffle set
c.add_edge(comp_in_ports[i], stack_shuffle.in_port(n_fake_samples))
c.add_edge(rand_perm_in_port,
stack_shuffle.in_port(n_fake_samples + 1))
gan_loss_arrow = GanLossArrow(n_fake_samples + 1)
# Connect output of each stack shuffle to discriminator
for i in range(cond_gen_non_error_out_ports):
c.add_edge(stack_shuffles[i].out_port(0), disc.in_port(i))
c.add_edge(disc.out_port(0), gan_loss_arrow.in_port(0))
c.add_edge(rand_perm_in_port, gan_loss_arrow.in_port(1))
# Add generator and discriminator loss ports
loss_d_port = c.add_port()
make_out_port(loss_d_port)
make_error_port(loss_d_port)
c.add_edge(gan_loss_arrow.out_port(0), loss_d_port)
loss_g_port = c.add_port()
make_out_port(loss_g_port)
make_error_port(loss_g_port)
c.add_edge(gan_loss_arrow.out_port(1), loss_g_port)
# Connect fake samples to output of composition
for i in range(n_fake_samples):
for j in range(cond_gen_non_error_out_ports):
sample = c.add_port()
make_out_port(sample)
c.add_edge(cond_gens[i].out_port(j), sample)
# Pipe up error ports
for cond_gen in cond_gens:
for i in range(cond_gen_non_error_out_ports, cond_gen.num_out_ports()):
error_port = c.add_port()
make_out_port(error_port)
c.add_edge(cond_gen.out_port(i), error_port)
assert c.is_wired_correctly()
return c
def unparam(arrow: Arrow, nnet: Arrow = None):
"""Unparameerize an arrow by sticking a tfArrow between its normal inputs,
and any parametric inputs
Args:
arrow: Y x Theta -> X
nnet: Y -> Theta
Returns:
Y -> X
"""
c = CompositeArrow(name="%s_unparam" % arrow.name)
in_ports = [p for p in arrow.in_ports() if not is_param_port(p)]
param_ports = [p for p in arrow.in_ports() if is_param_port(p)]
if nnet is None:
nnet = TfArrow(n_in_ports=len(in_ports), n_out_ports=len(param_ports))
for i, in_port in enumerate(in_ports):
c_in_port = c.add_port()
make_in_port(c_in_port)
transfer_labels(in_port, c_in_port)
c.add_edge(c_in_port, in_port)
c.add_edge(c_in_port, nnet.in_port(i))
for i, param_port in enumerate(param_ports):
c.add_edge(nnet.out_port(i), param_port)
for out_port in arrow.out_ports():
c_out_port = c.add_port()
make_out_port(c_out_port)
if is_error_port(out_port):
make_error_port(c_out_port)
transfer_labels(out_port, c_out_port)
c.add_edge(out_port, c_out_port)
assert c.is_wired_correctly()
return c
def create_arrow(arrow: CompositeArrow, equiv_thetas, port_attr, valid_ports,
symbt_ports):
# New parameter space should have nclasses elements
nclasses = num_unique_elem(equiv_thetas)
new_arrow = CompositeArrow(name="%s_elim" % arrow.name)
for out_port in arrow.out_ports():
c_out_port = new_arrow.add_port()
make_out_port(c_out_port)
transfer_labels(out_port, c_out_port)
if is_error_port(out_port):
make_error_port(c_out_port)
new_arrow.add_edge(out_port, c_out_port)
flat_shape = SourceArrow(np.array([nclasses], dtype=np.int32))
flatten = ReshapeArrow()
new_arrow.add_edge(flat_shape.out_port(0), flatten.in_port(1))
slim_param_flat = flatten.out_port(0)
batch_size = None
for in_port in arrow.in_ports():
if in_port in valid_ports:
symbt = symbt_ports[in_port]['symbolic_tensor']
indices = []
for theta in symbt.symbols:
setid = equiv_thetas[theta]
indices.append(setid)
shape = get_port_shape(in_port, port_attr)
if len(shape) > 1:
if batch_size is not None:
assert shape[0] == batch_size
batch_size = shape[0]
gather = GatherArrow()
src = SourceArrow(np.array(indices, dtype=np.int32))
shape_shape = SourceArrow(np.array(shape, dtype=np.int32))
reshape = ReshapeArrow()
new_arrow.add_edge(slim_param_flat, gather.in_port(0))
new_arrow.add_edge(src.out_port(0), gather.in_port(1))
new_arrow.add_edge(gather.out_port(0), reshape.in_port(0))
new_arrow.add_edge(shape_shape.out_port(0), reshape.in_port(1))
new_arrow.add_edge(reshape.out_port(0), in_port)
else:
new_in_port = new_arrow.add_port()
make_in_port(new_in_port)
if is_param_port(in_port):
make_param_port(new_in_port)
transfer_labels(in_port, new_in_port)
new_arrow.add_edge(new_in_port, in_port)
assert nclasses % batch_size == 0
slim_param = new_arrow.add_port()
make_in_port(slim_param)
make_param_port(slim_param)
new_arrow.add_edge(slim_param, flatten.in_port(0))
set_port_shape(slim_param, (batch_size, nclasses // batch_size))
assert new_arrow.is_wired_correctly()
return new_arrow
def comp(fwd: Arrow, right_inv: Arrow, DiffArrow=SquaredDifference):
"""Compositon: Pipe output of forward model into input of right inverse
Args:
fwd: X -> Y
right_inv: Y -> X x Error
Returns:
X -> X
"""
c = CompositeArrow(name="fwd_to_right_inv")
# Connect left boundar to fwd
for in_port in fwd.in_ports():
c_in_port = c.add_port()
make_in_port(c_in_port)
c.add_edge(c_in_port, in_port)
transfer_labels(in_port, c_in_port)
# Connect fwd to right_inv
for i, out_port in enumerate(fwd.out_ports()):
c.add_edge(out_port, right_inv.in_port(i))
# connect right_inv to right boundary
for out_port in right_inv.out_ports():
c_out_port = c.add_port()
make_out_port(c_out_port)
if is_error_port(out_port):
make_error_port(c_out_port)
c.add_edge(out_port, c_out_port)
transfer_labels(out_port, c_out_port)
# Find difference between X and right_inv(f(x))
right_inv_out_ports = list(filter(lambda port: not is_error_port(port),
right_inv.out_ports())) # len(X)
assert len(right_inv_out_ports) == len(c.in_ports())
for i, in_port in enumerate(c.in_ports()):
diff = DiffArrow()
c.add_edge(in_port, diff.in_port(0))
c.add_edge(right_inv_out_ports[i], diff.in_port(1))
error_port = c.add_port()
make_out_port(error_port)
make_error_port(error_port)
add_port_label(error_port, "supervised_error")
c.add_edge(diff.out_port(0), error_port)
assert c.is_wired_correctly()
return c
def eliminate_gathernd(arrow: CompositeArrow):
"""Eliminates redundant parameters in GatherNd
Args:
a: Parametric Arrow prime for eliminate!
Returns:
New Parameteric Arrow with fewer parameters"""
dupls = filter_arrows(lambda a: a.name in dupl_names, arrow)
for dupl in dupls:
slim_param_arrow = UpdateArrow()
constraints = None
free = None
shape = None
shape_source = None
for p in dupl.in_ports():
inv = arrow.neigh_ports(p)[0].arrow
if inv.name == 'InvGatherNd':
out, theta, indices = inv.in_ports()
make_not_param_port(theta)
arrow.add_edge(slim_param_arrow.out_port(0), theta)
indices_val = get_port_value(indices)
if shape is not None:
assert np.array_equal(
shape, np.array(get_port_shape(inv.out_port(0))))
else:
shape = np.array(get_port_shape(inv.out_port(0)))
shape_source = SourceArrow(shape)
out = arrow.neigh_ports(out)[0]
unset, unique = complement_bool_list(indices_val, shape)
free = unset if free is None else np.logical_and(
unset, free) # FIXME: don't really need bool anymore
unique_source = SourceArrow(unique)
unique_inds = SourceArrow(indices_val[tuple(
np.transpose(unique))])
# add in a constraint for these new known values
unique_upds = GatherNdArrow()
arrow.add_edge(out, unique_upds.in_port(0))
arrow.add_edge(unique_source.out_port(0),
unique_upds.in_port(1))
tmp = UpdateArrow()
if constraints is None:
constraints = SourceArrow(np.zeros(shape,
dtype=np.float32))
arrow.add_edge(constraints.out_port(0), tmp.in_port(0))
arrow.add_edge(unique_inds.out_port(0), tmp.in_port(1))
arrow.add_edge(unique_upds.out_port(0), tmp.in_port(2))
arrow.add_edge(shape_source.out_port(0), tmp.in_port(3))
constraints = tmp
if constraints is not None:
# put in knowns
arrow.add_edge(constraints.out_port(0),
slim_param_arrow.in_port(0))
# put in params
make_param_port(slim_param_arrow.in_port(2))
arrow.add_edge(shape_source.out_port(0),
slim_param_arrow.in_port(3))
inds = np.transpose(np.nonzero(free))
if (free == free[0]).all():
print("Assuming batched input")
inds = np.array(np.split(inds, shape[0]))
else:
print(
"WARNING: Unbatched input, haven't designed for this case")
inds_source = SourceArrow(inds)
arrow.add_edge(inds_source.out_port(0),
slim_param_arrow.in_port(1))
def supervised_loss_arrow(arrow: Arrow,
DiffArrow=SquaredDifference) -> CompositeArrow:
"""
Creates an arrow that computes |f(y) - x|
Args:
Arrow: f: Y -> X - The arrow to modify
DiffArrow: d: X x X - R - Arrow for computing difference
Returns:
f: Y/Theta x .. Y/Theta x X -> |f^{-1}(y) - X| x X
Arrow with same input and output as arrow except that it takes an
addition input with label 'train_output' that should contain examples
in Y, and it returns an additional error output labelled
'supervised_error' which is the |f(y) - x|
"""
c = CompositeArrow(name="%s_supervised" % arrow.name)
# Pipe all inputs of composite to inputs of arrow
# Make all in_ports of inverse inputs to composition
for in_port in arrow.in_ports():
c_in_port = c.add_port()
make_in_port(c_in_port)
if is_param_port(in_port):
make_param_port(c_in_port)
c.add_edge(c_in_port, in_port)
# find difference between inputs to inverse and outputs of fwd
# make error port for each
for i, out_port in enumerate(arrow.out_ports()):
if is_error_port(out_port):
# if its an error port just pass through
error_port = c.add_port()
make_out_port(error_port)
make_error_port(error_port)
transfer_labels(out_port, error_port)
c.add_edge(out_port, error_port)
else:
# If its normal outport then pass through
c_out_port = c.add_port()
make_out_port(c_out_port)
c.add_edge(out_port, c_out_port)
# And compute the error
diff = DiffArrow()
in_port = c.add_port()
make_in_port(in_port)
add_port_label(in_port, "train_output")
c.add_edge(in_port, diff.in_port(0))
c.add_edge(out_port, diff.in_port(1))
error_port = c.add_port()
make_out_port(error_port)
make_error_port(error_port)
add_port_label(error_port, "supervised_error")
c.add_edge(diff.out_port(0), error_port)
assert c.is_wired_correctly()
return c
def __init__(self, lmbda: float) -> None:
comp_arrow = CompositeArrow(name="ExponentialRVQuantile")
in_port = comp_arrow.add_port()
make_in_port(in_port)
out_port = comp_arrow.add_port()
make_out_port(out_port)
lmbda_source = SourceArrow(lmbda)
one_source = SourceArrow(1.0)
one_minus_p = SubArrow()
comp_arrow.add_edge(one_source.out_ports()[0],
one_minus_p.in_ports()[0])
comp_arrow.add_edge(in_port, one_minus_p.in_ports()[1])
ln = LogArrow()
comp_arrow.add_edge(one_minus_p.out_ports()[0], ln.in_ports()[0])
negate = NegArrow()
comp_arrow.add_edge(ln.out_ports()[0], negate.in_ports()[0])
div_lmbda = DivArrow()
comp_arrow.add_edge(negate.out_ports()[0], div_lmbda.in_ports()[0])
comp_arrow.add_edge(lmbda_source.out_ports()[0],
div_lmbda.in_ports()[1])
comp_arrow.add_edge(div_lmbda.out_ports()[0], out_port)
assert comp_arrow.is_wired_correctly()
self.quantile = comp_arrow
def SumNArrow(ninputs: int):
"""
Create arrow f(x1, ..., xn) = sum(x1, ..., xn)
Args:
n: number of inputs
Returns:
Arrow of n inputs and one output
"""
assert ninputs > 1
c = CompositeArrow(name="SumNArrow")
light_port = c.add_port()
make_in_port(light_port)
for _ in range(ninputs - 1):
add = AddArrow()
c.add_edge(light_port, add.in_port(0))
dark_port = c.add_port()
make_in_port(dark_port)
c.add_edge(dark_port, add.in_port(1))
light_port = add.out_port(0)
out_port = c.add_port()
make_out_port(out_port)
c.add_edge(add.out_port(0), out_port)
assert c.is_wired_correctly()
assert c.num_in_ports() == ninputs
return c
def inv_fwd_loss_arrow(arrow: Arrow,
inverse: Arrow,
DiffArrow=SquaredDifference) -> CompositeArrow:
"""
Arrow wihch computes |f(f^-1(y)) - y|
Args:
arrow: Forward function
Returns:
CompositeArrow
"""
c = CompositeArrow(name="%s_inv_fwd_loss" % arrow.name)
# Make all in_ports of inverse inputs to composition
for inv_in_port in inverse.in_ports():
in_port = c.add_port()
make_in_port(in_port)
if is_param_port(inv_in_port):
make_param_port(in_port)
c.add_edge(in_port, inv_in_port)
# Connect all out_ports of inverse to in_ports of f
for i, out_port in enumerate(inverse.out_ports()):
if not is_error_port(out_port):
c.add_edge(out_port, arrow.in_port(i))
c_out_port = c.add_port()
# add edge from inverse output to composition output
make_out_port(c_out_port)
c.add_edge(out_port, c_out_port)
# Pass errors (if any) of parametric inverse through as error_ports
for i, out_port in enumerate(inverse.out_ports()):
if is_error_port(out_port):
error_port = c.add_port()
make_out_port(error_port)
make_error_port(error_port)
add_port_label(error_port, "sub_arrow_error")
c.add_edge(out_port, error_port)
# find difference between inputs to inverse and outputs of fwd
# make error port for each
for i, out_port in enumerate(arrow.out_ports()):
diff = DiffArrow()
c.add_edge(c.in_port(i), diff.in_port(0))
c.add_edge(out_port, diff.in_port(1))
error_port = c.add_port()
make_out_port(error_port)
make_error_port(error_port)
add_port_label(error_port, "inv_fwd_error")
c.add_edge(diff.out_port(0), error_port)
assert c.is_wired_correctly()
return c