[DOCS][BUILD] Small improvements to documentation/build setup for first-time builds

[Lunderberg]

• Makefile

  • Target "crttest" ignored OUTPUTDIR variable

• .gitignore

  • Added ignores for download test data/models.

• docs/README.txt

  • Missing quotes on sphinx dep, needs pinned autodocsumm version

• docs/contribute/pull_request.rst

  • Use "ci_lint" docker image
  • Updated C++ test instructions to refer to the from_source installation for gtest.
  • Updated python test instructions with synr package dependency

• docs/langref/relay_expr.rst

  • Updated reference for example usage of TempExpr. src/relay/pass/alter_op_layout.cc
    no longer exists, and src/relay/transforms/alter_op_layout.cc doesn't use TempExpr.
    Picked a different use case as example.

• tests/scripts/task_cpp_unittest.sh

  • Updated "make crttest" to run only if "USE_MICRO" is enabled. While USE_MICRO is always enabled
    in the CI builds, task_cpp_unittest.sh is also recommended for use in
    docs/install/from_source.rst, which does not mandate USE_MICRO.

• docs/install/from_source.rst

  • Added -DMAKE_SHARED_LIBS=ON to the google test cmake config. By default, only static libs are
    generated for gtest, while TVM's build preferentially selects the shared libs.

• tutorials/get_started/auto_tuning_with_python.py

  • Changed norm_img_data to avoid loop, improve readability

• tutorials/get_started/relay_quick_start.py

  • Previous version used different input data passed to the initial and deployed module, then
    asserts that the results should be the same. Modified so that the same input data are passed in
    both cases.

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[jroesch]

LGTM

[hogepodge]

Looks good, one minor addition with respect to pinning dependencies. Thank you for catching those two errors in the getting started tutorials. I'm glad you had a chance to take them for a run!

[hogepodge]

My only comment is a small one. When we pin, we need to document why, and under what conditions we can un-pin. I can't speak to sphinx or Pillow, but we should link to this and note we can remove the pin when the change is in upstream packages. Chilipp/autodocsumm#42 (comment)

[Lunderberg]

Good point, and that makes sense. I will add that to the README.txt shortly.

There's probably also room for the gen_requirements.py to be used more in the docs/examples in the future. From what I can tell, the list of dependencies in it would be a perfect spot to centralize all dependency listings. Right now, it looks like it is primarily used in the CI framework, but the tvm/python/requirements/*.txt could be referred anywhere that currently has an explicit listing of the required packages.

[hogepodge]

LGTM

[tqchen]

Thanks @Lunderberg @jroesch @hogepodge