Downgrade scipy dependency for travis tests to pass

[neerajprad]

This enables the travis tests to pass again by using a lower version of scipy that has imresize function used by the AIR tutorial. This is needed until #1871 is fixed.

[jpchen]

we should remove observations as a dependency

[mattwescott]

Built a docker image at 3ac5a02, and it seems to have scipy==1.3 still

make test-examples is giving me cannot import name 'imresize' (#1871) until I manually downgrade.

[neerajprad]

@mattwescott - You will need to manually remove scipy==1.3 first. This change is for our CI, and for users who have not already updated scipy to 1.3. If you already have the latest scipy version, you will need to remove it, and run make install which should pick up the right scipy version that has the imresize function. A permanent fix for this is to remove dependency on the observations library.

[mattwescott]

@neerajprad That makes sense for my native environment, but I'd expect the docker build to emerge with the right version. What am I missing?

[neerajprad]

but I'd expect the docker build to emerge with the right version. What am I missing?

I would expect the same. Could you point me to how you are building the docker image?

[mattwescott]

@neerajprad Rebuilt with --no-cache and got scipy==1.3 again

Looks like it is coming from the other scipy dependency statement in setup.py: b06e5b5#diff-2eeaed663bd0d25b7e608891384b7298R115

[neerajprad]

Looks like it is coming from the other scipy dependency statement in setup.py:

That's my bad, I forgot that we had a dev dependency too. Will rectify it asap. Thanks for pointing out!