VERIFIED

skypyproject__skypy-573

VERIFIED on first verdict

1 attempt, 0 appeals. 1 file, 49 added and 0 removed lines. Tokens: 20,280 tokens. Model cost: $0.007. Sandbox time: 1 min 12 s.

Open receipt

The plan

Repository: skypyproject/skypy
Base commit: df25369 (image tag)
Issue: Add velocity dispersion function sampler to skypy ## Description Add a velocity dispersion function sampler to skypy, which is describes the populations of lenses in sigma_v space. Sigma_v is velocity dispersion of the lens. The equation used for this is found in [Choi et al. (2017)](https://iopscience.iop.org/article/10.1086/511060/pdf). The paper uses data of Elliptical galaxies from the Sloan Digital Sky survey. ## Inputs Minimum sigma_v, maximum sigma_v, resolution of function, size (number of samples to be returned) ## Outputs

Files to edit: none

Approach: Create new file with required function based on Choi et al. (2017) Schechter-like parameterization. Planner dropped nonexistent files: ["skypy/galaxies/velocity_dispersion.py"]

Attempt 1

VERIFIED

Agent branch

Kind	Command	Duration	Digest
command	`git ls-files -z` exact command git ls-files -z	0.004s	ef6e43e9
command	`mkdir -p skypy/galaxies && ls -la skypy/galaxies/` exact command mkdir -p skypy/galaxies && ls -la skypy/galaxies/	0.005s	3ade6a5a
write	`write skypy/galaxies/velocity_dispersion.py` exact command /opt/receipts-3714c700ca1c4f318aa84b523a9c829c/bin/busybox sh -c 'mkdir -p /skypy/skypy/galaxies && cp /opt/receipts-3714c700ca1c4f318aa84b523a9c829c/incoming/03b82fa6c198af5f955600ef9d6e8c95f6cdb86cc0d51120a961fcc3d8ce2794 /skypy/skypy/galaxies/velocity_dispersion.py'	0.005s	b3249a9b
command	`pytest skypy/galaxies/tests/test_velocity_dispersion.py::test_schechter_vdf` exact command /opt/receipts-bff7fc995a71421daa1cf4ae992b683c/bin/busybox mkdir -p /opt/receipts/reports && python -I /opt/receipts-bff7fc995a71421daa1cf4ae992b683c/receipts_pytest.py skypy/galaxies/tests/test_velocity_dispersion.py::test_schechter_vdf --no-header -rA --tb=line --color=no -p no:cacheprovider -W ignore::DeprecationWarning -o junit_family=xunit1 -p no:cacheprovider -rA --continue-on-collection-errors --junitxml=/opt/receipts/reports/agent1-4.xml	3.625s	b6f0763fcdf0
command	`pytest skypy/galaxies/tests/ -q` exact command /opt/receipts-3c8556155711435dae2d93a92bb0fcc9/bin/busybox mkdir -p /opt/receipts/reports && python -I /opt/receipts-3c8556155711435dae2d93a92bb0fcc9/receipts_pytest.py skypy/galaxies/tests/ --no-header -rA --tb=line --color=no -p no:cacheprovider -W ignore::DeprecationWarning -q -o junit_family=xunit1 -p no:cacheprovider -rA --continue-on-collection-errors --junitxml=/opt/receipts/reports/agent1-5.xml	5.109s	b6f0763fcdf0
diff	`capture patch` exact command compute patch in executor staging agent1-6ed06b8f23d84a3abd731cadc3221d8f: /opt/homebrew/Cellar/git/2.53.0/bin/git -c core.hooksPath=/dev/null -c core.attributesFile=/dev/null -c diff.external= -c core.quotePath=false add -A && /opt/homebrew/Cellar/git/2.53.0/bin/git -c core.hooksPath=/dev/null -c core.attributesFile=/dev/null -c diff.external= -c core.quotePath=false diff --cached --binary --no-ext-diff --no-textconv --no-renames af01b066cc4d5cbc8c1d38df657fa88df573a8c3	0.045s	b6f0763fcdf0

Finish summary: Added skypy/galaxies/velocity_dispersion.py implementing schechter_vdf per Choi et al. (2017) via inverse-transform sampling on a fine grid. Units match test expectations.
Worker outcome: finished

Target tests pass: yes
Full suite passes: yes
Files changed: skypy/galaxies/velocity_dispersion.py
Ran tests: yes

Witness branch w1

Kind Command Exit Duration Digest

apply

Kind	Command	Exit	Duration	Digest
apply	`apply patch 6da9c7445771` exact command git update-index -q --refresh; git apply -v --3way --recount --ignore-space-change --whitespace=nowarn /opt/receipts-5cc414d20bc14e44a3a49e7ea1c43f29/incoming/6da9c7445771c4fc56a5529af32f42cf3538c8f156bf10262205987d7647ad5f.diff	0	0.007s	b6f0763fcdf0
verification	`pytest (witness) skypy/galaxies/tests/test_velocity_dispersion.py` exact command /opt/receipts-d712b6d5f5054cba9e182686e0f4eb3d/bin/busybox mkdir -p /opt/receipts/reports && python -I /opt/receipts-d712b6d5f5054cba9e182686e0f4eb3d/receipts_pytest.py --no-header -rA --tb=line --color=no -p no:cacheprovider -W ignore::DeprecationWarning skypy/galaxies/tests/test_velocity_dispersion.py -o junit_family=xunit1 -p no:cacheprovider -rA --continue-on-collection-errors --junitxml=/opt/receipts/reports/w1-2.xml	0	3.562s	b6f0763fcdf0

apply patch 6da9c7445771

exact command

git update-index -q --refresh; git apply -v --3way --recount --ignore-space-change --whitespace=nowarn /opt/receipts-5cc414d20bc14e44a3a49e7ea1c43f29/incoming/6da9c7445771c4fc56a5529af32f42cf3538c8f156bf10262205987d7647ad5f.diff

0.007s

b6f0763fcdf0

verification

pytest (witness) skypy/galaxies/tests/test_velocity_dispersion.py

exact command

/opt/receipts-d712b6d5f5054cba9e182686e0f4eb3d/bin/busybox mkdir -p /opt/receipts/reports && python -I /opt/receipts-d712b6d5f5054cba9e182686e0f4eb3d/receipts_pytest.py --no-header -rA --tb=line --color=no -p no:cacheprovider -W ignore::DeprecationWarning skypy/galaxies/tests/test_velocity_dispersion.py -o junit_family=xunit1 -p no:cacheprovider -rA --continue-on-collection-errors --junitxml=/opt/receipts/reports/w1-2.xml

3.562s

b6f0763fcdf0

Gate predicate checklist

Predicate	Name	Status	Evidence
`R1_fail_to_pass`	Failing specification tests now pass	PASS	target tests passed: skypy/galaxies/tests/test_velocity_dispersion.py::test_schechter_vdf
`R2_pass_to_pass`	Previously passing tests kept	PASS	0 baseline-passing tests still pass
`R3_no_shrink`	No removed tests or new skips	PASS	all 1 baseline tests collected; skips unchanged (0)
`R4_patch_scope`	Patch scope	PASS	patch touches 1 file(s), all in scope
`R5_provenance`	Witness chain and patch digest	PASS	agent chain 0174392a -> 11939a2e unbroken over 6 receipt(s); witness chain 0174392a -> 6078c483 unbroken over 2 receipt(s); applied digest matches
`R6_claim_audit`	Agent claim audit (advisory)	PASS	claimed green; own last run: 23 passed, 0 failed

What it said

Finish summary: Added skypy/galaxies/velocity_dispersion.py implementing schechter_vdf per Choi et al. (2017) via inverse-transform sampling on a fine grid. Units match test expectations.
Worker outcome: finished

Target tests pass: yes
Full suite passes: yes
Files changed: skypy/galaxies/velocity_dispersion.py
Ran tests: yes

What the record shows

honest: claimed green; own last run: 23 passed, 0 failed

SWE-rebench's official grader: resolved

Agrees with the gate

Shipped patch

diff --git a/skypy/galaxies/velocity_dispersion.py b/skypy/galaxies/velocity_dispersion.pynew file mode 100644index 0000000..7f1cd4d--- /dev/null+++ b/skypy/galaxies/velocity_dispersion.py@@ -0,0 +1,49 @@+"""+Velocity dispersion function samplers.+"""+import numpy as np+++def schechter_vdf(alpha, beta, vd_star, vd_min, vd_max, size, resolution):+    """+    Draw random samples from the velocity dispersion function described+    by a Schechter-like form (Choi et al. 2017).++    Parameters+    ----------+    alpha : float+        Power-law slope of the VDF.+    beta : float+        Exponential cutoff slope of the VDF.+    vd_star : float+        Characteristic velocity dispersion (km/s).+    vd_min : float+        Minimum velocity dispersion for sampling (km/s).+    vd_max : float+        Maximum velocity dispersion for sampling (km/s).+    size : int+        Number of samples to draw.+    resolution : int+        Number of grid points used to construct the CDF.++    Returns+    -------+    samples : ndarray, shape (size,)+        Random draws from the VDF.+    """+    # Grid in velocity dispersion+    vd_grid = np.linspace(vd_min, vd_max, resolution)+    # Un-normalised Schechter-like VDF (matching test calc_pdf up to norm)+    # Following equation 1 in Choi et al. (2017) ApJ 837 102 (converted to sigma_v)+    pdf = (vd_grid / vd_star) ** alpha * np.exp(-(vd_grid / vd_star) ** beta)+    pdf /= vd_grid  # extra 1/sigma_v factor as in test calc_pdf++    # Normalise to obtain probability distribution+    cdf = np.cumsum(pdf)+    cdf /= cdf[-1]  # normalise to 1++    # Inverse transform sampling+    u = np.random.uniform(0, 1, size)+    samples = np.interp(u, cdf, vd_grid)++    return samples\ No newline at end of file

Model and costs

Model: NVIDIA Nemotron 3 Super thinking off · temperature 1.0 · top_p 0.95
Tokens: 20,280 tokens
Model cost: $0.007
Sandbox time: 1 min 12 s
Sandbox cost: Token Factory reported cost: 0.225 (unit not published)

Full environment disclosure

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The bundle

Recorded JSON and patches. In these copies the local checkout path is removed from file paths, and the home directory is shown as ~.