Fixed #930 Improve ignore_trivial Docstring and Warnings

stumpy/aamp.py

@@ -396,6 +396,7 @@ def aamp(T_A, m, T_B=None, ignore_trivial=True, p=2.0, k=1):
     """
     if T_B is None:
         T_B = T_A.copy()
+        core.check_self_join(ignore_trivial)
         ignore_trivial = True
 
     T_A, T_A_subseq_isfinite = core.preprocess_non_normalized(T_A, m)

stumpy/aamped.py

@@ -375,6 +375,7 @@ def aamped(client, T_A, m, T_B=None, ignore_trivial=True, p=2.0, k=1):
     """
     if T_B is None:
         T_B = T_A.copy()
+        core.check_self_join(ignore_trivial)
         ignore_trivial = True
 
     T_A, T_A_subseq_isfinite = core.preprocess_non_normalized(T_A, m)

stumpy/core.py

@@ -4509,3 +4509,24 @@ def _update_incremental_PI(D, P, I, excl_zone, n_appended=0):
             _shift_insert_at_index(I[-1], idx, i + n_appended)
 
     return
+
+
+def check_self_join(ignore_trivial):
+    """
+    A simple function to check whether `ignore_trivial` is `True` for a self-join
+
+    Otherwise, warn the user.
+
+    Parameters
+    ----------
+    ignore_trivial : bool
+        Set to True if this is a self-join. Otherwise, for AB-join, set this to False.
+
+    Returns
+    -------
+    None
+    """
+    if not ignore_trivial:
+        msg = "`ignore_trivial` cannot be `False` for a self-join and "
+        msg += "has been automatically overridden and set to `True`."
+        warnings.warn(msg)

stumpy/gpu_aamp.py

@@ -519,6 +519,7 @@ def gpu_aamp(T_A, m, T_B=None, ignore_trivial=True, device_id=0, p=2.0, k=1):
     """
     if T_B is None:  # Self join!
         T_B = T_A
+        core.check_self_join(ignore_trivial)
         ignore_trivial = True
 
     T_A, T_A_subseq_isfinite = core.preprocess_non_normalized(T_A, m)

stumpy/gpu_stump.py

@@ -515,8 +515,11 @@ def gpu_stump(
         Default is  ``None`` which corresponds to a self-join.
 
     ignore_trivial : bool, default True
-        Set to ``True`` if this is a self-join. Otherwise, for AB-join, set this
-        to ``False``.
+        Set to ``True`` if this is a self-join (i.e., for a single time series
+        ``T_A`` without ``T_B``). This ensures that an exclusion zone is applied
+        to each subsequence in ``T_A`` and all trivial/self-matches are ignored.
+        Otherwise, for an AB-join (i.e., between two times series, ``T_A`` and
+        ``T_B``), set this to ``False``.
 
     device_id : int or list, default 0
         The (GPU) device number to use. The default value is ``0``. A list of
@@ -644,6 +647,7 @@ def gpu_stump(
     """
     if T_B is None:  # Self join!
         T_B = T_A
+        core.check_self_join(ignore_trivial)
         ignore_trivial = True
         T_B_subseq_isconstant = T_A_subseq_isconstant
 

stumpy/scraamp.py

@@ -621,6 +621,7 @@ def __init__(
 
         if T_B is None:
             T_B = T_A
+            core.check_self_join(self._ignore_trivial)
             self._ignore_trivial = True
 
         self._m = m

stumpy/scrump.py

@@ -810,8 +810,11 @@ def __init__(
             subsequence in T_A, its nearest neighbor in T_B will be recorded.
 
         ignore_trivial : bool, default True
-            Set to `True` if this is a self-join. Otherwise, for AB-join, set this to
-            `False`. Default is `True`.
+            Set to ``True`` if this is a self-join (i.e., for a single time series
+            ``T_A`` without ``T_B``). This ensures that an exclusion zone is applied
+            to each subsequence in ``T_A`` and all trivial/self-matches are ignored.
+            Otherwise, for an AB-join (i.e., between two times series, ``T_A`` and
+            ``T_B``), set this to ``False``.
 
         percentage : float, default 0.01
             Approximate percentage completed. The value is between 0.0 and 1.0.
@@ -867,6 +870,7 @@ def __init__(
 
         if T_B is None:
             T_B = T_A
+            core.check_self_join(self._ignore_trivial)
             self._ignore_trivial = True
             T_B_subseq_isconstant = T_A_subseq_isconstant
 

stumpy/stomp.py

@@ -70,6 +70,7 @@ def _stomp(T_A, m, T_B=None, ignore_trivial=True):
 
     if T_B is None:
         T_B = T_A
+        core.check_self_join(ignore_trivial)
         ignore_trivial = True
 
     T_A, μ_Q, σ_Q, Q_subseq_isconstant = core.preprocess(T_A, m)

stumpy/stump.py

@@ -542,8 +542,11 @@ def stump(
         Default is ``None`` which corresponds to a self-join.
 
     ignore_trivial : bool, default True
-        Set to ``True`` if this is a self-join. Otherwise, for AB-join, set this
-        to ``False``.
+        Set to ``True`` if this is a self-join (i.e., for a single time series
+        ``T_A`` without ``T_B``). This ensures that an exclusion zone is applied
+        to each subsequence in ``T_A`` and all trivial/self-matches are ignored.
+        Otherwise, for an AB-join (i.e., between two times series, ``T_A`` and
+        ``T_B``), set this to ``False``.
 
     normalize : bool, default True
         When set to ``True``, this z-normalizes subsequences prior to computing
@@ -677,6 +680,7 @@ def stump(
     mparray([4, 3, 0, 1, 0])
     """
     if T_B is None:
+        core.check_self_join(ignore_trivial)
         ignore_trivial = True
         T_B = T_A
         T_B_subseq_isconstant = T_A_subseq_isconstant

stumpy/stumped.py

@@ -429,8 +429,11 @@ def stumped(
         Default is ``None`` which corresponds to a self-join.
 
     ignore_trivial : bool, default True
-        Set to ``True`` if this is a self-join. Otherwise, for AB-join, set this
-        to ``False``.
+        Set to ``True`` if this is a self-join (i.e., for a single time series
+        ``T_A`` without ``T_B``). This ensures that an exclusion zone is applied
+        to each subsequence in ``T_A`` and all trivial/self-matches are ignored.
+        Otherwise, for an AB-join (i.e., between two times series, ``T_A`` and
+        ``T_B``), set this to ``False``.
 
     normalize : bool, default True
         When set to ``True``, this z-normalizes subsequences prior to computing
@@ -585,6 +588,7 @@ def stumped(
     """
     if T_B is None:
         T_B = T_A
+        core.check_self_join(ignore_trivial)
         ignore_trivial = True
         T_B_subseq_isconstant = T_A_subseq_isconstant
 

tests/test_core.py

@@ -1963,3 +1963,9 @@ def test_update_incremental_PI_egressTrue_MemoryCheck():
 
         npt.assert_almost_equal(P_ref, P_comp)
         npt.assert_almost_equal(I_ref, I_comp)
+
+
+def test_check_self_join():
+    with pytest.warns(UserWarning):
+        ignore_trivial = False
+        core.check_self_join(ignore_trivial)