qiskit/releasenotes/notes/0.20/add-parameter-prefix-suppor...

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---
features:
- |
The constructors for the :class:`~qiskit.circuit.library.ZFeatureMap` and
:class:`~qiskit.circuit.library.ZZFeatureMap` classes have a new keyword
argument ``parameter_prefix``. This new argument is used to set the prefix
of parameters of the data encoding circuit. For example:
.. code-block::
from qiskit.circuit.library import ZFeatureMap
feature_map = ZFeatureMap(feature_dimension=4, parameter_prefix="my_prefix")
feature_map.decompose().draw('mpl')
the generated :class:`~qiskit.circuit.library.ZFeatureMap` circuit has
prefixed all its internal parameters with the prefix ``"my_prefix"``.