Conda package: broken or missing pyflann dependency

[mosco]

Pyflann doesn't seem to be installed properly on MacOS after installing megaman.

Steps to recreate:

1. Create a conda python 3.5 environment.
2. Run conda install megaman --channel=conda-forge.
3. Open python and run the command from megaman.geometry import Geometry.

On my computer, this fails with the following error message:

In [4]: from megaman.geometry import Geometry
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-4-3d5e7524d7bf> in <module>()
----> 1 from megaman.geometry import Geometry

/usr/local/anaconda3/envs/megaman/lib/python3.5/site-packages/megaman/geometry/__init__.py in <module>()
      2
      3 from .rmetric import RiemannMetric
----> 4 from .geometry import Geometry
      5 from .adjacency import Adjacency, compute_adjacency_matrix, adjacency_methods
      6 from .affinity import Affinity, compute_affinity_matrix, affinity_methods

/usr/local/anaconda3/envs/megaman/lib/python3.5/site-packages/megaman/geometry/geometry.py in <module>()
     34 from scipy import sparse
     35 from scipy.special import gammaln
---> 36 from .adjacency import compute_adjacency_matrix
     37 from .affinity import compute_affinity_matrix
     38 from .laplacian import compute_laplacian_matrix

/usr/local/anaconda3/envs/megaman/lib/python3.5/site-packages/megaman/geometry/adjacency.py in <module>()
      5 from scipy import sparse
      6
----> 7 from .cyflann.index import Index as CyIndex
      8 from .utils import RegisterSubclasses
      9

ImportError: dlopen(/usr/local/anaconda3/envs/megaman/lib/python3.5/site-packages/megaman/geometry/cyflann/index.cpython-35m-darwin.so, 2): Library not loaded: @rpath/libflann.1.8.dylib
  Referenced from: /usr/local/anaconda3/envs/megaman/lib/python3.5/site-packages/megaman/geometry/cyflann/index.cpython-35m-darwin.so
  Reason: image not found

Installing pyflann using conda install --channel=jakevdp pyflann resolves this.

• Amit Moscovich

[AntoineDujardin]

Similar error on Unix, but installing pyflann did not solve the problem.