@tom
I did prepend the conda channel:
$ conda config --prepend channels \
> https://public.dhe.ibm.com/ibmdl/export/pub/software/server/ibm-ai/conda/

but are you sure that is the right URL address? I get the following error:
$ conda install torchvision powerai-release=1.7.0

Collecting package metadata (current_repodata.json): failed

CondaHTTPError: HTTP 500 INTERNAL SERVER ERROR for url <https://public.dhe.ibm.com/ibmdl/export/pub/software/server/ibm-ai/conda/linux-ppc64le/current_repodata.json>
Elapsed: 00:00.706870

A remote server error occurred when trying to retrieve this URL.

A 500-type error (e.g. 500, 501, 502, 503, etc.) indicates the server failed to
fulfill a valid request.  The problem may be spurious, and will resolve itself if you
try your request again.  If the problem persists, consider notifying the maintainer
of the remote server.