Several tests seem to be failing

[marcinz]

The tests that are failing.

The tests that fail on CPU:

[FAIL] (CPU) tests/pandas/df_drop_duplicates.py
[FAIL] (CPU) tests/pandas/sr_astype_invalid.py
[FAIL] (CPU) tests/pandas/sr_at.py
[FAIL] (CPU) tests/pandas/sr_drop_duplicates.py
[FAIL] (CPU) tests/pandas/sr_iat.py

All of these fail on one CPU, but on 2 CPUs only at and iat fail.

Tests that fail on one GPU:

[FAIL] (GPU) tests/pandas/df_join.py

All tests seem to fail on 2 GPUs. Must be something obvious.

[marcinz]

The tests on 2 GPUs were failing due to the CI setup, not due to a problem in Pandas.

Now, we have the following tests failing on a single CPU:

[FAIL] (CPU) tests/pandas/sr_at.py
[FAIL] (CPU) tests/pandas/sr_iat.py

On 2 CPUs, [FAIL] (CPU) tests/pandas/sr_astype_invalid.py fails as well.

On GPUs (both a single one and two) only [FAIL] (GPU) tests/pandas/df_join.py is failing.