fix: do coherence analysis only if there are non-fk columns in tgt (#131)

Author: lukaszkolodziejczyk

mostlyai/qa/reporting.py

@@ -252,7 +252,8 @@ def report(
                 )
             )
 
-        do_coherence = setup == "1:N"
+        # do coherence analysis only if there are non-fk columns in the target data
+        do_coherence = setup == "1:N" and len(trn_tgt_data.columns) > 1
         if do_coherence:
             _LOG.info("prepare training data for coherence started")
             trn_coh, trn_coh_bins = pull_data_for_coherence(

tests/end_to_end/test_report.py

@@ -213,6 +213,7 @@ def make_dfs(
         {"dfs": make_dfs(ctx_rows=100, tgt_rows=100, shift=100, tgt_cols=["tgt_col"]), "early_term": True},
         # other setups should produce report
         {"dfs": make_dfs(ctx_rows=100, tgt_rows=100), "early_term": False},
+        {"dfs": make_dfs(ctx_rows=101, tgt_rows=100), "early_term": False},
         {"dfs": make_dfs(ctx_rows=100, tgt_rows=100, ctx_cols=["ctx_col"], tgt_cols=["tgt_col"]), "early_term": False},
     ]