Dependency resolution failure: pip works but poetry cannot install turicreate 6.4.1

• I am on the latest Poetry version.

• I have searched the issues of this repo and believe that this is not a duplicate.

• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: <OS X as well as Ubuntu 18.04–>

• Poetry version: 1.1.0b2 & 1.1.0rc1

• Link of a Gist with the contents of your pyproject.toml file: gist contains pyproject toml + result of poetry add -vvv turicreate=6.4.1

Issue

poetry does not correctly resolve the dependencies for turicreate whereas pip does.

turicreate version 6.4.1 depends on coremltools version 4.0b3. This can be seen by downloading the 3.8 wheel and inspecting:

$ pkginfo -f requires_dist turicreate-6.4.1-cp38-cp38-manylinux1_x86_64.whl
requires_dist: ['decorator (>=4.0.9)', 'numpy', 'pandas (>=0.23.2)', 'pillow (>=5.2.0)', 'prettytable (==0.7.2)', 'resampy (==0.2.1)', 'requests (>=2.9.1)', 'scipy (>=1.1.0)', 'six (>=1.10.0)', 'coremltools (==4.0b3)', 'tensorflow (>=2.0.0)', 'numba (<0.51.0)']

poetry add coremltools=4.0b3 works as expected. However, the problem comes with poetry add turicreate=6.4.1:

Updating dependencies
Resolving dependencies... (0.1s)

  SolverProblemError

  Because turicreate (6.4.1) depends on coremltools (3.3)
   and  depends on coremltools (4.0b3), turicreate is forbidden.
  So, because  depends on turicreate (6.4.1), version solving failed.

  at ~/.poetry/lib/poetry/puzzle/solver.py:241 in _solve
      237│             packages = result.packages
      238│         except OverrideNeeded as e:
      239│             return self.solve_in_compatibility_mode(e.overrides, use_latest=use_latest)
      240│         except SolveFailure as e:
    → 241│             raise SolverProblemError(e)
      242│
      243│         results = dict(
      244│             depth_first_search(
      245│                 PackageNode(self._package, packages), aggregate_package_nodes

In contrast, pip install turicreate=6.4.1 works as expected.

$ pip install turicreate==6.4.1
Collecting turicreate==6.4.1
  Downloading turicreate-6.4.1-cp38-cp38-manylinux1_x86_64.whl (92.0 MB)
     |████████████████████████████████| 92.0 MB 29 kB/s
...
Collecting coremltools==4.0b3
  Downloading coremltools-4.0b3-py3-none-any.whl (4.6 MB)
     |████████████████████████████████| 4.6 MB 2.3 MB/s
...

Why does poetry not find the correct dependency when pip does 😭 ?

[malcolmgreaves]

Thank you so much for your help! 🙏

[abn]

@malcolmgreaves done.