Aaron Fenyes
b040bbb7fe
Drop old code from examples
2024-07-18 00:50:48 -07:00
Aaron Fenyes
9007c8bc7c
Circles in triangle: jiggle the guess
2024-07-18 00:49:09 -07:00
Aaron Fenyes
a7f9545a37
Circles in triangle: correct frozen variables
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Since the self-product of the point at infinity is left unspecified, the
first three components can vary without violating any constraints. To
keep the point at infinity where it's supposed to be, we freeze all of
its components.
2024-07-18 00:43:00 -07:00
Aaron Fenyes
74c7f64b0c
Correct sign of normal in plane utility
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Clarify the relevant notes too.
2024-07-18 00:03:12 -07:00
Aaron Fenyes
d0340c0b65
Correct point utility again
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The balance between the light cone basis vectors was wrong, throwing the
point's coordinates off by a factor of two.
2024-07-17 23:37:28 -07:00
Aaron Fenyes
69a704d414
Use notes' sign convention for light cone basis
2024-07-17 23:07:34 -07:00
Aaron Fenyes
01f44324c1
Tetrahedron radius ratio: find radius ratio
2024-07-17 22:45:17 -07:00
Aaron Fenyes
96ffc59642
Tetrahedron radius ratio: tweak guess
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Jiggle the vertex guesses. Put the circumscribed sphere guess on-shell.
2024-07-17 19:01:34 -07:00
Aaron Fenyes
a02b76544a
Tetrahedron radius ratio: add circumscribed sphere
2024-07-17 18:55:36 -07:00
Aaron Fenyes
6e719f9943
Tetrahedron radius ratio: correct vertex guesses
2024-07-17 18:27:58 -07:00
Aaron Fenyes
d51d43f481
Correct point utility
2024-07-17 18:27:22 -07:00
Aaron Fenyes
6d233b5ee9
Tetrahedron radius ratio: correct signs
2024-07-17 18:08:36 -07:00
Aaron Fenyes
5abd4ca6e1
Revert "Give spheres positive radii in examples"
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This reverts commit 4728959ae0
2024-07-17 17:49:43 -07:00
Aaron Fenyes
ea640f4861
Start tetrahedron radius ratio example
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Add the vertices of the tetrahedron to the `sphere-in-tetrahedron`
example.
2024-07-17 17:33:32 -07:00
Aaron Fenyes
4728959ae0
Give spheres positive radii in examples
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This changes the meaning of `indep_val` in the overlapping pyramids
example, so we adjust `indep_val` to get a nice-looking construction.
2024-07-17 17:22:33 -07:00
Aaron Fenyes
2038103d80
Write examples directly in light cone basis
2024-07-17 15:37:14 -07:00
Aaron Fenyes
bde42ebac0
Switch engine to light cone basis
2024-07-17 14:30:43 -07:00
Aaron Fenyes
e6cf08a9b3
Make tetrahedron faces planar
2024-07-15 23:54:59 -07:00
Aaron Fenyes
7c77481f5e
Don't constrain self-product of frozen vector
2024-07-15 23:39:05 -07:00
Aaron Fenyes
1ce609836b
Implement frozen variables
2024-07-15 22:11:54 -07:00
Aaron Fenyes
b185fd4b83
Switch to backtracking Newton's method in Optim
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This performs much better than the trust region Newton's method for the
actual `circles-in-triangle` problem. (The trust region method performs
better for the simplified problem produced by the conversion bug.)
2024-07-15 15:52:38 -07:00
Aaron Fenyes
94e0d321d5
Switch back to BigFloat precision in examples
2024-07-15 14:31:30 -07:00
Aaron Fenyes
53d8c38047
Preserve explicit zeros in Gram matrix conversion
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In previous commits, the `circles-in-triangle` example converged much
more slowly in BigFloat precision than in Float64 precision. This
turned out to be a sign of a bug in the Float64 computation: converting
the Gram matrix using `Float64.()` dropped the explicit zeros, removing
many constraints and making the problem much easier to solve. This
commit corrects the Gram matrix conversion. The Float64 search now
solves the same problem as the BigFloat search, with comparable
performance.
2024-07-15 14:08:57 -07:00
Aaron Fenyes
7b3efbc385
Clean up backtracking gradient descent code
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Drop experimental singularity handling strategies. Reduce the default
tolerance to within 64-bit floating point precision. Report success.
2024-07-15 13:15:15 -07:00
Aaron Fenyes
25b09ebf92
Sketch backtracking Newton's method
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This code is a mess, but I'm committing it to record a working state
before I start trying to clean up.
2024-07-15 11:32:04 -07:00
Aaron Fenyes
3910b9f740
Use Newton's method for polishing
2024-07-11 13:43:52 -07:00
Aaron Fenyes
d538cbf716
Correct improvement threshold by using unit step
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Our formula for the improvement theshold works when the step size is
an absolute distance. However, in commit `4d5ea06`, the step size was
measured relative to the current gradient instead. This commit scales
the base step to unit length, so now the step size really is an absolute
distance.
2024-07-10 23:31:44 -07:00
Aaron Fenyes
4d5ea062a3
Record gradient and last line search in history
2024-07-09 15:00:13 -07:00
Aaron Fenyes
5652719642
Require triangle sides to be planar
2024-07-09 14:10:23 -07:00
Aaron Fenyes
f84d475580
Visualize neighborhoods of global minima
2024-07-09 14:01:30 -07:00
Aaron Fenyes
77bc124170
Change loss function to match gradient
2024-07-09 14:00:24 -07:00
Aaron Fenyes
023759a267
Start "circles in triangle" from a very close guess
2024-07-08 14:21:10 -07:00
Aaron Fenyes
610fc451f0
Track slope in gradient descent history
2024-07-08 14:19:25 -07:00
Aaron Fenyes
93dd05c317
Add required package to "sphere in tetrahedron" example
2024-07-08 14:19:05 -07:00
Aaron Fenyes
9efa99e8be
Test gradient descent for circles in triangle
2024-07-08 12:56:28 -07:00
Aaron Fenyes
828498b3de
Add sphere and plane utilities to engine
2024-07-08 12:56:14 -07:00
Aaron Fenyes
736ac50b07
Test gradient descent for sphere in tetrahedron
2024-07-07 17:58:55 -07:00
Aaron Fenyes
ea354b6c2b
Randomize guess in gradient descent test
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Randomly perturb the pre-solved part of the guess, and randomly choose
the unsolved part.
2024-07-07 17:56:12 -07:00
Aaron Fenyes
d39244d308
Host Ganja.js locally
2024-07-06 21:35:09 -07:00
Aaron Fenyes
7e94fef19e
Improve random vector generator
2024-07-06 21:32:43 -07:00
Aaron Fenyes
abc53b4705
Sketch random vector generator
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This needs to be rewritten: it can fail at generating spacelike vectors.
2024-07-02 17:16:31 -07:00
Aaron Fenyes
17fefff61e
Name gradient descent test more specifically
2024-07-02 17:16:19 -07:00
Aaron Fenyes
133519cacb
Encapsulate gradient descent code
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The completed gram matrix from this commit matches the one from commit
e7dde58
2024-07-02 15:02:59 -07:00
Aaron Fenyes
e7dde5800c
Do gradient descent entirely in BigFloat
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The previos version accidentally returned steps in Float64.
2024-07-02 12:35:12 -07:00
Aaron Fenyes
242d630cc6
Get Ganja.js to display planes
2024-06-27 21:49:53 -07:00
Aaron Fenyes
8eb1ebb8d2
Merge branch 'ganja' into gram
2024-06-26 15:57:07 -07:00
Aaron Fenyes
05a824834d
Let visibility controls scroll
2024-06-26 15:56:51 -07:00
Aaron Fenyes
a113f33635
Merge branch 'ganja' into gram
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Get visibility controls.
2024-06-26 15:52:20 -07:00
Aaron Fenyes
5ea32ac53c
Streamline visibility controls
2024-06-26 15:51:57 -07:00
Aaron Fenyes
3eb4fc6c91
Add element visibility controls
2024-06-26 15:24:31 -07:00
