Add / update imperative information

[kastein]

AMR parser does not always correctly identify verbs in imperative mode but sometimes :mode imperative and :ARG0 you are missing. Adding them where missed could improve generation, e.g. T5 model from amrlib generates "Cooking with a hot waffle iron" from the AMR for "Cook on hot waffle iron" if both are missing, but generates "Cook with a hot waffle iron" if mode and ARG0 information is included.

Additionally, node 'you' gets aligned to the same token as the predicate it belongs to and if more predicates in imperative mode occur in a sentence 'you' can only be aligned to one them. -> might happen that the predicate node for the token to which the node 'you' is aligned is no longer part of the action-level AMR after splitting.

• [x] update alignment information if necessary

Consider

• [x] add information as part of splitting postprocessing
• [x] add index of corresponding predicate as token alignment Difficulties: need to figure out to which action-aligned nodes it should be attached and to which not; e.g. Ac vs Af, multi-token actions

[kastein]

Probably need the :ARG0 and imperative information for generation.

single AMR to sentence generation does often not generate sentences in imperative mode otherwise:

• Topped with mozzarella cheese.
• Shredding mozzarella cheese.
• Parmesan preparations.
• The oven is heated.
• You're a drain.

Adding sentence context might help here but definitely worth to consider adding information manually

[kastein]

Addressed in commit: 7396b05581538c38a2f42ad1507a42f685fc8324 :ARG0 'you' gets added to a node if all of the following applies

• the node is the root node or a direct :opX child of the root 'and' node
• is a predicate frame
• is aligned to an action node
• does not have a ARG0 argument

If it is additionally the case that the node has not :mode 'imperative' attribute then the attribute gets added as well. Added 'you' and added 'imperative' get aligned to the same token as the predicate.