update for ICLR

# Please enter the commit message for your changes. Lines starting
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# Date:      Sun Sep 25 18:05:58 2022 +0200
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# On branch main
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# Changes to be committed:
#	modified:   README.md
#	modified:   main_graph_classification.py
#	modified:   main_longrange.py
#	modified:   main_synthetic.py
#	new file:   models/graph/ampv2.py
#	modified:   models/longrange/amp_act.py
#	new file:   models/longrange/amp_att.py
#	modified:   models/longrange/amp_gru.py
#	modified:   models/longrange/amp_iter.py
#	modified:   models/longrange/amp_lstm.py
#	modified:   models/longrange/amp_rnn.py
#	renamed:    models/synthetic/amp.py -> models/synthetic/amp_constant.py
#	new file:   models/synthetic/amp_random.py
#	modified:   plot_longrange.py
#	modified:   synthetic_datasets.py
#
# Untracked files:
#	.idea/
#	env2.yml
#
