[question] Override of transitive dependencies

[geoHeil]

Overriding pypi dependencies seems to work like: #3948

however, how can conda dependencies be overwritten? (nvidia-cuda-nvrtc-cu12)

Further from looking at said PR ( #3948 ) how to specify the option for pixi is still a bit unclear for me

[project]
name = "foo"
version = "1.0.0"
description = "bar"
authors = [{ name = "name", email = "me@corp.com" }]
requires-python = ">3.12,<3.13"

[tool.pixi.project]
platforms = ["linux-64", "osx-arm64"]
channels = ["conda-forge"]

[tool.pixi.environments]
dev = { features = ["thing-cpu"], solve-group = "thing-cpu" }
dev-gpu = { features = ["thing-gpu"], solve-group = "thing-gpu" }

[tool.pixi.feature.thing-cpu.dependencies]
[tool.pixi.feature.thing-cpu.pypi-dependencies]
torch = { version = "~=2.8.0", index = "https://download.pytorch.org/whl/cpu" }
paddlepaddle = { version = ">=3.1.1,<3.2", index = "https://www.paddlepaddle.org.cn/packages/stable/cpu/" }

[tool.pixi.feature.thing-gpu]
system-requirements = { cuda = "12.9" }
[tool.pixi.feature.thing-gpu.target.linux-64.pypi-dependencies]
torch = { version = "~=2.8.0", index = "https://download.pytorch.org/whl/cu129" }
paddlepaddle-gpu = { version = ">=3.1.1,<3.2", index = "https://www.paddlepaddle.org.cn/packages/stable/cu129/" }

Fails with:

Error:   × failed to solve the pypi requirements of environment 'dev-gpu' for platform 'linux-64'
  ├─▶ failed to resolve pypi dependencies
  ╰─▶ Because only the following versions of torch are available:
          torch<2.8.0
          torch==2.8.0+cu129
      and torch==2.8.0+cu129 depends on nvidia-cuda-nvrtc-cu12{platform_machine == 'x86_64' and sys_platform == 'linux'}==12.9.86, we can conclude that torch>=2.8.0 depends on nvidia-cuda-nvrtc-cu12{platform_machine == 'x86_64' and sys_platform == 'linux'}==12.9.86.
      And because paddlepaddle-gpu==3.1.1 depends on nvidia-cuda-nvrtc-cu12{platform_machine == 'x86_64' and sys_platform == 'linux'}==12.9.41 and only paddlepaddle-gpu<=3.1.1 is available, we can conclude that paddlepaddle-gpu>=3.1.1 and torch>=2.8.0 are incompatible.
      And because you require torch>=2.8.0 and paddlepaddle-gpu>=3.1.1, we can conclude that your requirements are unsatisfiable.

The problem in detail

# Torch
nvidia-cuda-nvrtc-cu12{platform_machine == 'x86_64' and sys_platform == 'linux'}==12.9.86
# PaddlePaddle
nvidia-cuda-nvrtc-cu12{platform_machine == 'x86_64' and sys_platform == 'linux'}==12.9.41

How can I pixi to force resolve with 12.9.86?

[geoHeil]

When I try to add:

[tool.pixi.feature.thing-gpu]
system-requirements = { cuda = "12.9" }
platforms = ["linux-64"]
[tool.pixi.feature.thing-gpu.pypi-options.dependency-overrides]
"nvidia-cuda-nvrtc-cu12" = "==12.9.86"

the error still is the same - why does the override not work? Am I using it wrong?

Error:   × failed to solve the pypi requirements of environment 'molgrapher-gpu' for platform 'linux-64'
  ├─▶ failed to resolve pypi dependencies
  ╰─▶ Because only the following versions of torch are available:
          torch<2.8.0
          torch==2.8.0+cu129
      and torch==2.8.0+cu129 depends on nvidia-cuda-runtime-cu12{platform_machine == 'x86_64' and sys_platform == 'linux'}==12.9.79, we can conclude that torch>=2.8.0 depends on nvidia-cuda-runtime-cu12{platform_machine == 'x86_64' and sys_platform == 'linux'}==12.9.79.
      And because paddlepaddle-gpu==3.1.1 depends on nvidia-cuda-runtime-cu12{platform_machine == 'x86_64' and sys_platform == 'linux'}==12.9.37 and only paddlepaddle-gpu<=3.1.1 is available, we can conclude that paddlepaddle-gpu>=3.1.1 and torch>=2.8.0 are incompatible.
      And because you require torch>=2.8.0 and paddlepaddle-gpu>=3.1.1, we can conclude that your requirements are unsatisfiable.

[geoHeil]

Adding:

[tool.pixi.feature.molgrapher-gpu.pypi-options.dependency-overrides]
nvidia-cuda-nvrtc-cu12 = "==12.9.86"
nvidia-cuda-runtime-cu12 = "==12.9.79"
nvidia-cuda-cupti-cu12   = "==12.9.79"
nvidia-cudnn-cu12 = "==9.10.2.21"
nvidia-cublas-cu12 = "==12.9.1.4"
nvidia-cufft-cu12 = "==11.4.1.4"
nvidia-cusolver-cu12 = "==11.7.5.82"
nvidia-cusparse-cu12 = "==12.5.10.65"
nvidia-nccl-cu12 = "==2.27.3"
nvidia-nvtx-cu12 = "==12.9.79"
nvidia-nvjitlink-cu12 = "==12.9.86"
nvidia-cufile-cu12 = "==1.14.1.1"

makes /forces pixi to resolve