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WIP: Clean up the outline view #16

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Vectornaut wants to merge 29 commits from outline-cleanup into main
pull from: outline-cleanup
merge into: glen:main
Conversation 2 Commits 29 Files Changed 13 +105 -14
2 changed files with 105 additions and 14 deletions
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1
app-proto/run-examples
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@ -3,5 +3,6 @@
# https://jonalmeida.com/posts/2015/01/23/print-cargo/
#
cargo test -- --nocapture engine::tests::irisawa_hexlet_test
cargo test -- --nocapture engine::tests::three_spheres_example
cargo test -- --nocapture engine::tests::point_on_sphere_example

116
app-proto/src/engine.rs
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@ -37,7 +37,7 @@ pub fn sphere_with_offset(dir_x: f64, dir_y: f64, dir_z: f64, off: f64, curv: f6
struct MatrixEntry {
index: (usize, usize),
val: f64
value: f64
}
struct PartialMatrix(Vec<MatrixEntry>);
@ -56,7 +56,7 @@ impl PartialMatrix {
let mut result = DMatrix::<f64>::zeros(rhs.nrows(), rhs.ncols());
let PartialMatrix(entries) = self;
for ent in entries {
result[ent.index] = ent.val - rhs[ent.index];
result[ent.index] = ent.value - rhs[ent.index];
}
result
}
@ -141,7 +141,7 @@ fn realize_gram(
let total_dim = element_dim * assembly_dim;
// scale the tolerance
let scale_adjustment = ((guess.ncols() - frozen.len()) as f64).sqrt();
let scale_adjustment = (gram.0.len() as f64).sqrt();
let tol = scale_adjustment * scaled_tol;
// convert the frozen indices to stacked format
@ -153,7 +153,7 @@ fn realize_gram(
let mut state = SearchState::from_config(gram, guess);
for _ in 0..max_descent_steps {
// stop if the loss is tolerably low
println!("loss: {}", state.loss);
println!("scaled loss: {}", state.loss / scale_adjustment);
/* println!("projected error: {}", state.err_proj); */
if state.loss < tol { break; }
@ -182,6 +182,7 @@ fn realize_gram(
// regularize the Hessian
let min_eigval = hess.symmetric_eigenvalues().min();
/* println!("lowest eigenvalue: {}", min_eigval); */
if min_eigval <= 0.0 {
hess -= reg_scale * min_eigval * DMatrix::identity(total_dim, total_dim);
}
@ -198,6 +199,12 @@ fn realize_gram(
}
// compute the Newton step
/*
we need to either handle or eliminate the case where the minimum
eigenvalue of the Hessian is zero, so the regularized Hessian is
singular. right now, this causes the Cholesky decomposition to return
`None`, leading to a panic when we unrap
*/
let base_step_stacked = hess.cholesky().unwrap().solve(&neg_grad_stacked);
let base_step = base_step_stacked.reshape_generic(Dyn(element_dim), Dyn(assembly_dim));
@ -217,17 +224,17 @@ fn realize_gram(
#[cfg(test)]
mod tests {
use std::f64;
use std::{array, f64::consts::PI};
use super::*;
#[test]
fn sub_proj_test() {
let target = PartialMatrix(vec![
MatrixEntry { index: (0, 0), val: 19.0 },
MatrixEntry { index: (0, 2), val: 39.0 },
MatrixEntry { index: (1, 1), val: 59.0 },
MatrixEntry { index: (1, 2), val: 69.0 }
MatrixEntry { index: (0, 0), value: 19.0 },
MatrixEntry { index: (0, 2), value: 39.0 },
MatrixEntry { index: (1, 1), value: 59.0 },
MatrixEntry { index: (1, 2), value: 69.0 }
]);
let attempt = DMatrix::<f64>::from_row_slice(2, 3, &[
1.0, 2.0, 3.0,
@ -248,7 +255,7 @@ mod tests {
for k in 0..3 {
entries.push(MatrixEntry {
index: (j, k),
val: if j == k { 1.0 } else { -1.0 }
value: if j == k { 1.0 } else { -1.0 }
});
}
}
@ -266,6 +273,88 @@ mod tests {
assert!(state.loss.abs() < f64::EPSILON);
}
// this problem is from a sangaku by Irisawa Shintarō Hiroatsu. the article
// below includes a nice translation of the problem statement, which was
// recorded in Uchida Itsumi's book _Kokon sankan_ (_Mathematics, Past and
// Present_)
//
// "Japan's 'Wasan' Mathematical Tradition", by Abe Haruki
// https://www.nippon.com/en/japan-topics/c12801/
//
#[test]
fn irisawa_hexlet_test() {
let gram = PartialMatrix({
let mut entries = Vec::<MatrixEntry>::new();
for s in 0..9 {
// each sphere is represented by a spacelike vector
entries.push(MatrixEntry { index: (s, s), value: 1.0 });
// the circumscribing sphere is tangent to all of the other
// spheres, with matching orientation
if s > 0 {
entries.push(MatrixEntry { index: (0, s), value: 1.0 });
entries.push(MatrixEntry { index: (s, 0), value: 1.0 });
}
if s > 2 {
// each chain sphere is tangent to the "sun" and "moon"
// spheres, with opposing orientation
for n in 1..3 {
entries.push(MatrixEntry { index: (s, n), value: -1.0 });
entries.push(MatrixEntry { index: (n, s), value: -1.0 });
}
// each chain sphere is tangent to the next chain sphere,
// with opposing orientation
let s_next = 3 + (s-2) % 6;
entries.push(MatrixEntry { index: (s, s_next), value: -1.0 });
entries.push(MatrixEntry { index: (s_next, s), value: -1.0 });
}
}
entries
});
let guess = DMatrix::from_columns(
[
sphere(0.0, 0.0, 0.0, 15.0),
sphere(0.0, 0.0, -9.0, 5.0),
sphere(0.0, 0.0, 11.0, 3.0)
].into_iter().chain(
(1..=6).map(
|k| {
let ang = (k as f64) * PI/3.0;
sphere(9.0 * ang.cos(), 9.0 * ang.sin(), 0.0, 2.5)
}
)
).collect::<Vec<_>>().as_slice()
);
let frozen: [(usize, usize); 4] = array::from_fn(|k| (3, k));
const SCALED_TOL: f64 = 1.0e-12;
let (config, success) = realize_gram(
&gram, guess, &frozen,
SCALED_TOL, 0.5, 0.9, 1.1, 200, 110
);
print!("\nCompleted Gram matrix:{}", config.tr_mul(&*Q) * &config);
let final_state = SearchState::from_config(&gram, config);
if success {
println!("Target accuracy achieved!");
} else {
println!("Failed to reach target accuracy");
}
println!("Loss: {}", final_state.loss);
if success {
println!("\nChain diameters:");
println!(" {} sun (given)", 1.0 / final_state.config[(3, 3)]);
for k in 4..9 {
println!(" {} sun", 1.0 / final_state.config[(3, k)]);
}
}
let entry_tol = SCALED_TOL.sqrt();
let solution_diams = [30.0, 10.0, 6.0, 5.0, 15.0, 10.0, 3.75, 2.5, 2.0 + 8.0/11.0];
for (k, diam) in solution_diams.into_iter().enumerate() {
assert!((final_state.config[(3, k)] - 1.0 / diam).abs() < entry_tol);
}
}
// --- process inspection examples ---
// these tests are meant for human inspection, not automated use. run them
@ -281,7 +370,7 @@ mod tests {
for k in 0..3 {
entries.push(MatrixEntry {
index: (j, k),
val: if j == k { 1.0 } else { -1.0 }
value: if j == k { 1.0 } else { -1.0 }
});
}
}
@ -318,7 +407,7 @@ mod tests {
for k in 0..2 {
entries.push(MatrixEntry {
index: (j, k),
val: if (j, k) == (1, 1) { 1.0 } else { 0.0 }
value: if (j, k) == (1, 1) { 1.0 } else { 0.0 }
});
}
}
@ -328,9 +417,10 @@ mod tests {
point(0.0, 0.0, 2.0),
sphere(0.0, 0.0, 0.0, 1.0)
]);
let frozen = [(3, 0)];
println!();
let (config, success) = realize_gram(
&gram, guess, &[(3, 0)],
&gram, guess, &frozen,
1.0e-12, 0.5, 0.9, 1.1, 200, 110
);
print!("\nCompleted Gram matrix:{}", config.tr_mul(&*Q) * &config);