Import Error in pts/modules/distribution_output.py

[ClaraGrthns]

With the new version of Gluonts (v: 0.15.0) there are import errors in pts/modules/distribution_output.py.

the following lines yield the Import Error:

from gluonts.torch.distributions.distribution_output import (
    DistributionOutput,
    LambdaLayer,
    PtArgProj,
)

I propose the following import of Modules:

from gluonts.torch.distributions.distribution_output import DistributionOutput
from gluonts.torch.modules.lambda_layer import LambdaLayer
from gluonts.torch.distributions.output import PtArgProj