genomicsem 0.1.1

Rust-accelerated Genomic Structural Equation Modeling

genomicsem

Rust-accelerated GenomicSEM for Python. Multivariate LD Score Regression and Structural Equation Modeling on GWAS summary statistics.

Repository · Issue tracker · API compatibility notes · Architecture & performance

Install

pip install genomicsem

From source (requires Rust toolchain):

pip install maturin
cd bindings/python && maturin develop --release

Usage

import genomicsem as gsem

# LDSC
result = gsem.ldsc(
    traits=["trait1.sumstats.gz", "trait2.sumstats.gz"],
    sample_prev=[None, None],
    pop_prev=[None, None],
    ld="eur_w_ld_chr/",
)
result.s       # np.ndarray — genetic covariance matrix
result.v       # np.ndarray — sampling covariance matrix
result.i_mat   # np.ndarray — intercept matrix
result.n       # list — sample sizes
result.m_total # float — number of SNPs

# Every downstream function accepts the `result` object directly. You
# can also pass a plain dict with `s`, `v`, `i_mat`, `n_vec`, `m` fields,
# or a dict using the uppercase `S`, `V`, `I`, `N`, `m` keys that match
# the R GenomicSEM convention.

# Common factor model
cf = gsem.commonfactor(result)
# cf is a dict: {parameters: {lhs, op, rhs, est, se, z, p}, chisq, df, ...}

# User-specified SEM
um = gsem.usermodel(
    result,
    model="F1 =~ NA*V1 + V2\nF1 ~~ 1*F1\nV1 ~~ V1\nV2 ~~ V2",
    estimation="DWLS",
)

# Munge
gsem.munge(
    files=["gwas1.txt", "gwas2.txt"],
    hm3="w_hm3.snplist",
    trait_names=["T1", "T2"],
)

# Merge sumstats
gsem.sumstats(
    files=["T1.sumstats.gz", "T2.sumstats.gz"],
    ref_dir="eur_w_ld_chr/",
    trait_names=["V1", "V2"],
)

# GWAS — results come back as a columnar dict. Feed it straight into pandas:
#   import pandas as pd; df = pd.DataFrame({k: v for k, v in res.items() if k != "params"})
res = gsem.commonfactor_gwas(result, "merged_sumstats.tsv")
res = gsem.user_gwas(result, "merged_sumstats.tsv", model="F1 =~ NA*V1 + V2\nF1 ~ SNP")

# Parallel analysis
gsem.parallel_analysis(result.s, result.v, r=500)

# Auto-generate model syntax
gsem.write_model(loadings=[[0.7, 0.0], [0.6, 0.0], [0.0, 0.8]], names=["V1", "V2", "V3"])

# Genetic correlation
gsem.rgmodel(result, model="")

Functions

Every exported function has a worked example in its docstring — run help(gsem.ldsc), help(gsem.commonfactor), etc. to see them.

Core pipeline: munge, ldsc, sumstats, commonfactor, usermodel, user_gwas, commonfactor_gwas

Advanced: hdl, s_ldsc, enrich, parallel_analysis, write_model, rgmodel, multi_snp, multi_gene, sim_ldsc, summary_gls

Note on commonfactor_gwas: genomicsem's commonfactor_gwas matches R GenomicSEM::userGWAS on the equivalent single-factor model, but does not numerically match R GenomicSEM::commonfactorGWAS, which uses a different internal parameterization. See ARCHITECTURE.md §3.3 for the full rationale. A one-time warning is emitted on first use; suppress it by setting GSEMR_COMMONFACTOR_GWAS_QUIET=1 in the environment.

Citation

Grotzinger, A. D., Rhemtulla, M., de Vlaming, R., Ritchie, S. J., Mallard, T. T., Hill, W. D., Ip, H. F., Marioni, R. E., McIntosh, A. M., Deary, I. J., Koellinger, P. D., Harden, K. P., Nivard, M. G., & Tucker-Drob, E. M. (2019). Genomic structural equation modelling provides insights into the multivariate genetic architecture of complex traits. Nature human behaviour, 3(5), 513–525. https://doi.org/10.1038/s41562-019-0566-x

License

GPL-3.0