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// SPDX-License-Identifier: EPL-2.0 OR GPL-2.0-or-later
// SPDX-FileCopyrightText: Bradley M. Bell <bradbell@seanet.com>
// SPDX-FileContributor: 2003-22 Bradley M. Bell
// ----------------------------------------------------------------------------
/*
{xrst_begin graph_atom_op.cpp}
C++ AD Graph Atomic Three Functions: Example and Test
#####################################################
Source Code
***********
{xrst_literal
// BEGIN C++
// END C++
}
{xrst_end graph_atom_op.cpp}
*/
// BEGIN C++
# include <cppad/cppad.hpp>
bool atom_op(void)
{ bool ok = true;
using std::string;
// -----------------------------------------------------------------------
// Define f_0 (x_0, x_1; p) = x_1 + p_0 * x_0
//
// This function does not have an atomic function operator
// node_1 : p[0]
// node_2 : x[0]
// node_3 : x[1]
// node_4 : p[0] * x[0]
// node_5 : x[1] + p[0] * x[0]
// y[0] = x[1] + p[0] * x[0]
//
// C++ graph object
CppAD::cpp_graph graph_obj;
//
// operator being used
CppAD::graph::graph_op_enum op_enum;
//
// set scalars
graph_obj.function_name_set("f(x; p)");
size_t n_dynamic_ind = 1;
graph_obj.n_dynamic_ind_set(n_dynamic_ind);
size_t n_variable_ind = 2;
graph_obj.n_variable_ind_set(n_variable_ind);
//
// node_4 : p[0] * x[0]
op_enum = CppAD::graph::mul_graph_op;
graph_obj.operator_vec_push_back(op_enum);
graph_obj.operator_arg_push_back(1);
graph_obj.operator_arg_push_back(2);
//
// node_5 : x[1] + p[0] * x[0]
op_enum = CppAD::graph::add_graph_op;
graph_obj.operator_vec_push_back(op_enum);
graph_obj.operator_arg_push_back(3);
graph_obj.operator_arg_push_back(4);
//
// y[0] = x[1] + p[0] * x[0]
graph_obj.dependent_vec_push_back(5);
//
// f(x, p) = x_1 + p_0 * x_0
CppAD::ADFun<float> f;
f.from_graph(graph_obj);
//
ok &= f.Domain() == 2;
ok &= f.Range() == 1;
ok &= f.size_dyn_ind() == 1;
//
// A ckhpoint_two function with name f(x; p) is derived from
// an atomic_three function with the same name.
bool internal_bool = false;
bool use_hes_sparsity = false;
bool use_base2ad = false;
bool use_in_parallel = false;
CppAD::chkpoint_two<float> chk_f(f, "f(x; p)",
internal_bool, use_hes_sparsity, use_base2ad, use_in_parallel
);
// -----------------------------------------------------------------------
// g (u_0, u_1; p, q) = f(u_0 + q_0, u_1 + q_1, p)
// = u_1 + q_1 + p_0 * ( u_0 + q_0 )
//
// This function has an atomic function operator with name f(x; p)
// node_1 : q[0]
// node_2 : q[1]
// node_3 : u[0]
// node_4 : u[1]
// node_5 : u[0] + q[0]
// node_6 : u[1] + q[1]
// node_7 : f( u[0] + q[0], u[1] + q[1]; p)
// y[0] = u[1] + q[1] + p[0] * (u[0] + q[0])
//
graph_obj.initialize();
//
graph_obj.function_name_set("g(u; p, q)");
n_dynamic_ind = 2;
graph_obj.n_dynamic_ind_set(n_dynamic_ind);
n_variable_ind = 2;
graph_obj.n_variable_ind_set(n_variable_ind);
//
// node_5 : u[0] + q[0]
op_enum = CppAD::graph::add_graph_op;
graph_obj.operator_vec_push_back(op_enum);
graph_obj.operator_arg_push_back(3);
graph_obj.operator_arg_push_back(1);
//
// node_6 : u[1] + q[1]
graph_obj.operator_vec_push_back(op_enum);
graph_obj.operator_arg_push_back(4);
graph_obj.operator_arg_push_back(2);
//
// node_7 : f( u[0] + q[0], u[1] + q[1]; p)
//
// name_index, n_result, n_arg come before first_node
size_t name_index = graph_obj.atomic_name_vec_size();
graph_obj.atomic_name_vec_push_back("f(x; p)");
//
op_enum = CppAD::graph::atom_graph_op;
graph_obj.operator_vec_push_back(op_enum);
graph_obj.operator_arg_push_back(name_index); // name_index
graph_obj.operator_arg_push_back(1); // n_result
graph_obj.operator_arg_push_back(2); // n_node_arg
graph_obj.operator_arg_push_back(5); // first node arg
graph_obj.operator_arg_push_back(6); // second node arg
//
// y[0] = u[1] + q[1] + p[0] * (u[0] + q[0])
graph_obj.dependent_vec_push_back(7);
// ------------------------------------------------------------------------
CppAD::ADFun<float> g;
g.from_graph(graph_obj);
// ------------------------------------------------------------------------
ok &= g.Domain() == 2;
ok &= g.Range() == 1;
ok &= g.size_dyn_ind() == 2;
//
// set p in g(u; p, q)
CPPAD_TESTVECTOR(float) p(1);
p[0] = 2.0;
chk_f.new_dynamic(p);
//
// set q in g(u; p, q)
CPPAD_TESTVECTOR(float) q(2);
q[0] = 3.0;
q[1] = 4.0;
g.new_dynamic(q);
//
// evaluate g(u; p, q)
CPPAD_TESTVECTOR(float) u(2), y(1);
u[0] = 5.0;
u[1] = 6.0;
y = g.Forward(0, u);
//
// check value
ok &= y[0] == u[1] + q[1] + p[0] * (u[0] + q[0]);
// ------------------------------------------------------------------------
g.to_graph(graph_obj);
g.from_graph(graph_obj);
// ------------------------------------------------------------------------
ok &= g.Domain() == 2;
ok &= g.Range() == 1;
ok &= g.size_dyn_ind() == 2;
//
// set p in g(u; p, q)
p[0] = 3.0;
chk_f.new_dynamic(p);
//
// set q in g(u; p, q)
q[0] = 4.0;
q[1] = 5.0;
g.new_dynamic(q);
//
// evaluate g(u; p, q)
u[0] = 6.0;
u[1] = 7.0;
y = g.Forward(0, u);
//
// check value
ok &= y[0] == u[1] + q[1] + p[0] * (u[0] + q[0]);
// ------------------------------------------------------------------------
return ok;
}
// END C++
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