zmughal commented on a change in pull request #20852:
URL: https://github.com/apache/incubator-mxnet/pull/20852#discussion_r793925590
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File path: perl-package/AI-MXNet/lib/AI/MXNet/Metric.pm
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@@ -79,7 +79,7 @@ use overload '""' => sub {
has 'name' => (is => 'rw', isa => 'Str');
has 'num' => (is => 'rw', isa => 'Int');
has 'num_inst' => (is => 'rw', isa => 'Maybe[Int|ArrayRef[Int]]');
-has 'sum_metric' => (is => 'rw', isa => 'Maybe[Num|ArrayRef[Num]]');
+has 'sum_metric' => (is => 'rw', isa => 'Maybe[Num|ArrayRef[Num]|PDL]');
Review comment:
Yes, that is correct, they return a PDL now (since PDL v2.056). This is
to make sure that types such as complex numbers and BAD values can be correctly
returned. To get a single Perl scalar out of a PDL, you can do `$pdl->sclr`.
Though for many situations, this should work like a Perl scalar due to operator
overloading.
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