bartorch.nlop.Constant

class bartorch.nlop.Constant(value, shape=None)

An operator of no inputs that returns value. BART’s nlop_const.

Combined with another operator and linked into one of its inputs, this is how a model’s fixed quantity – a sampling pattern, an echo time – is pinned; pin() does exactly that in one step. BART copies the tensor, so the one passed in is free afterwards.

__init__(value, shape=None)

Methods

__init__(value[, shape])
adjoint(dy)	DF(x)^H dy at the last evaluated point, for one input and one output.
chain(other, *[, output, input])	Output output of self into input input of other.
combine(other)	self and other side by side, sharing nothing.
del_out([output])	Drop an output, and everything computed only for it.
derivative(dx)	DF(x) dx at the last evaluated point, for one input and one output.
dup([a, b])	Make two inputs of the same shape one input, kept at a.
flatten([inputs_only])	Every input as one flat vector, and every output as another.
forward(*xs)	F(x), which also fixes where every derivative is taken.
jacobian([output, input])	DF/dx_input of one output, as a LinearOperator.
linearize(*xs)	The derivative at x, as a LinearOperator.
link([output, input])	Tie an output back into an input; both arguments go away.
permute_inputs(perm)	Reorder the inputs: the new input i is the old perm[i].
permute_outputs(perm)	Reorder the outputs: the new output o is the old perm[o].
pin(input, value)	Fix one input to value; the input goes away.
reshape_input(input, shape)	This operator with one input's shape written differently.
reshape_output(output, shape)	This operator with one output's shape written differently.
shift_input(new, old)	Move one input to another position, the rest closing up behind it.
shift_output(new, old)	Move one output to another position, the rest closing up behind it.
stack_inputs(a, b, axis)	Make two inputs one, concatenated along a C-order axis.
stack_outputs(a, b, axis)	Make two outputs one, concatenated along a C-order axis.

Attributes

device
ishape	The domain, for an operator with one input.
ishapes	The shape of each argument, outputs and inputs kept apart.
oshape	The codomain, for an operator with one output.
oshapes