Add a test of windows shorter than the sink - there is a flaw that needs to be fixed, so the sinks aren't working even though the rest of it seems to

Author: AngledLuffa

stanza/tests/constituency/test_lstm_model.py

@@ -436,10 +436,14 @@ def test_relative_attention_directional(pretrain_file):
     run_forward_checks(model)
 
 def test_relative_attention_sinks(pretrain_file):
+    model = build_model(pretrain_file, '--no_use_lattn', '--use_rattn', '--rattn_heads', '10', '--no_rattn_cat', '--rattn_window', '2', '--rattn_sinks', '1')
+    run_forward_checks(model)
     model = build_model(pretrain_file, '--no_use_lattn', '--use_rattn', '--rattn_heads', '10', '--no_rattn_cat', '--rattn_sinks', '2')
     run_forward_checks(model)
 
 def test_relative_attention_cat_sinks(pretrain_file):
+    model = build_model(pretrain_file, '--no_use_lattn', '--use_rattn', '--rattn_heads', '10', '--rattn_cat', '--rattn_window', '2', '--rattn_sinks', '1')
+    run_forward_checks(model)
     model = build_model(pretrain_file, '--no_use_lattn', '--use_rattn', '--rattn_heads', '10', '--rattn_cat', '--rattn_sinks', '2')
     run_forward_checks(model)