From 3fd7013cace498276e98d3a837aaa8a71b9f5a02 Mon Sep 17 00:00:00 2001
From: Matthew Tamayo-Rios <matthew@geekbeast.com>
Date: Thu, 20 Aug 2026 20:09:50 +0000
Subject: [PATCH] Declare fbm as a runtime dependency, not a dev extra
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powersig/util/__init__.py imports fbm_utils eagerly and fbm_utils does
`from fbm import FBM`, so fbm is needed to import the package at all — but it
was only listed in the dev extra and requirements-dev.txt. On a plain install
powersig.util.grid, powersig.torch.algorithm and powersig.cupy_backend.algorithm
all raise ModuleNotFoundError: No module named 'fbm'. That is the torch and cupy
backends unimportable from a released wheel.

fbm is safe to require: version 0.3.0 is a pure-Python py3-none-any wheel, four
source modules, no compiled extensions, and numpy is its only dependency — which
this project already requires. Nothing CUDA-specific or platform-specific.

Removed from the dev extra and requirements-dev.txt, where it is now redundant.

Verified: the three imports above succeed, and tests/test_core_jax.py stays
21/21.
---
 pyproject.toml       | 4 +++-
 requirements-dev.txt | 1 -
 requirements.txt     | 1 +
 3 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/pyproject.toml b/pyproject.toml
index 34fc020..8ccd2a9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -33,6 +33,9 @@ classifiers = [
     "Topic :: Scientific/Engineering :: Mathematics",
 ]
 dependencies = [
+    # Imported at package load: powersig/util/__init__.py pulls in fbm_utils,
+    # so the torch, cupy and jax backends all need it just to import.
+    "fbm>=0.3.0",
     "numpy>=1.26.4",
     "scikit-learn>=1.3.2",
     "tqdm>=4.67.1",
@@ -46,7 +49,6 @@ cupy = ["cupy-cuda12x>=13.4.1"]
 cupy-cuda13 = ["cupy-cuda13x>=13.6.0"]
 dev = [
     "pytest>=7.0",
-    "fbm>=0.3.0",
 ]
 all = [
     "jax[cuda13]>=0.10.0",
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 029be2d..d882c63 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -5,6 +5,5 @@ matplotlib
 git+https://github.com/crispitagorico/sigkernel.git
 git+https://github.com/geekbeast/KSig.git
 git+https://github.com/FrancescoPiatti/polysigkernel.git
-fbm
 seaborn
 datasets
\ No newline at end of file
diff --git a/requirements.txt b/requirements.txt
index 4e73976..25eb641 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -17,6 +17,7 @@ setuptools
 aeon
 numba==0.61.2
 cupy-cuda13x>=13.6.0
+fbm
 psutil
 tqdm==4.67.1
 jax[cuda13]>=0.10.0