Skip to content
View zhangzzk's full-sized avatar
  • Germany

Block or report zhangzzk

Block user

Prevent this user from interacting with your repositories and sending you notifications. Learn more about blocking users.

You must be logged in to block users.

Content in all repositories owned by your account will be closed.
Maximum 250 characters. Please don’t include any personal information such as legal names or email addresses. Markdown is supported. This note will only be visible to you.
Report abuse

Contact GitHub support about this user’s behavior. Learn more about reporting abuse.

Report abuse
zhangzzk/README.md

Scientific machine learning for astronomical images, probabilistic models, and cosmic structure

Website  ·  Email  ·  Munich, Germany

I am a PhD researcher at LMU Munich, finishing in 2027. My projects move between pixels, catalogues, modeling and parameter inference. I build image simulations, machine-learning models, and statistical analysis.

I am interested in scientific ML and research roles with simulation, systematics, and uncertainty.

Featured projects

FORKLENS: calibrated image regression

FORKLENS shear calibration before and after learned weighting

FORKLENS uses a two-branch CNN to read a galaxy image and its point-spread function separately. Small neural networks then calibrate the ensemble and learn how much weight to give each object.

Paper: FORKLENS: Accurate weak-lensing shear measurement with deep learning

SBSI and BlendEMU: image simulation and Bayesian inference

Simulated overlapping galaxies before and after applying shear to neighbouring objects

Overlapping objects create a difficult inference problem: a measurement at one position can contain signal from several sources, and detection itself changes which objects enter the sample. BlendEMU simulates and measures that process; SBSI folds the learned response into likelihood-based inference.

SBSI conditional measurement-flow distributions for bright, typical, and faint galaxies

Paper: Emulating redshift mixing due to blending in weak gravitational lensing

Skyvar: spatially varying selection

Posterior-predictive checks for clean and spatially contaminated data

Skyvar models the spatial variation of image quality, noise, and extinction across an observed field. It integrates large catalogues through a learned detection model, caches sample selection, models spatial correlations, and propagates the error into parameter inference.

Paper: Anisotropic redshift distributions in photometric galaxy clustering and their cosmological impact

Pinned Loading

  1. SBSI SBSI Public

    Simulation-based shear inference.

    Python

  2. blendemu blendemu Public

    End-to-end weak lensing blending pipeline.

    Python

  3. forklens forklens Public

    Deep learning weak lensing shear estimation

    Python 4 3

  4. skyvar skyvar Public

    Anisotropic galaxy clutering

    Python