Merge pull request #465 from djarecka/fix/states_connection

[wip] fixing connections for multiple inputs

pydra/engine/core.py

@@ -952,16 +952,21 @@ def create_connections(self, task, detailed=False):
                             (task.name, field.name, val.name, val.field)
                         )
                     logger.debug("Connecting %s to %s", val.name, task.name)
-
+                    # adding a state from the previous task to other_states
                     if (
                         getattr(self, val.name).state
                         and getattr(self, val.name).state.splitter_rpn_final
                     ):
-                        # adding a state from the previous task to other_states
-                        other_states[val.name] = (
-                            getattr(self, val.name).state,
-                            field.name,
-                        )
+                        # adding task_name: (task.state, [a field from the connection]
+                        if val.name not in other_states:
+                            other_states[val.name] = (
+                                getattr(self, val.name).state,
+                                [field.name],
+                            )
+                        else:
+                            # if the task already exist in other_state,
+                            # additional field name should be added to the list of fields
+                            other_states[val.name][1].append(field.name)
                 else:  # LazyField with the wf input
                     # connections with wf input should be added to the detailed graph description
                     if detailed:

pydra/engine/state.py

@@ -304,9 +304,10 @@ def inner_inputs(self):
         """
         if self.other_states:
             _inner_inputs = {}
-            for name, (st, inp) in self.other_states.items():
+            for name, (st, inp_l) in self.other_states.items():
                 if f"_{st.name}" in self.splitter_rpn_compact:
-                    _inner_inputs[f"{self.name}.{inp}"] = st
+                    for inp in inp_l:
+                        _inner_inputs[f"{self.name}.{inp}"] = st
             return _inner_inputs
         else:
             return {}
@@ -323,6 +324,10 @@ def update_connections(self, new_other_states=None, new_combiner=None):
         """
         if new_other_states:
             self.other_states = new_other_states
+        # ensuring that the connected fields are set as a list
+        self.other_states = {
+            nm: (st, ensure_list(flds)) for nm, (st, flds) in self.other_states.items()
+        }
         self._connect_splitters()
         if new_combiner:
             self.combiner = new_combiner
@@ -388,8 +393,93 @@ def _complete_prev_state(self, prev_state=None):
             prev_state = [f"_{name}" for name in self.other_states]
             if len(prev_state) == 1:
                 prev_state = prev_state[0]
+
+        if isinstance(prev_state, list):
+            prev_state = self._removed_repeated(prev_state)
         return prev_state
 
+    def _removed_repeated(self, previous_splitters):
+        """removing states from previous tasks that are repeated either directly or indirectly"""
+        for el in previous_splitters:
+            if el[1:] not in self.other_states:
+                raise hlpst.PydraStateError(
+                    f"can't ask for splitter from {el[1:]}, other nodes that are connected: {self.other_states}"
+                )
+
+        repeated = set(
+            [
+                (el, previous_splitters.count(el))
+                for el in previous_splitters
+                if previous_splitters.count(el) > 1
+            ]
+        )
+        if repeated:
+            # assuming that I want to remove fro right
+            previous_splitters.reverse()
+            for el, cnt in repeated:
+                for ii in range(cnt):
+                    previous_splitters.remove(el)
+            previous_splitters.reverse()
+
+        el_state = []
+        el_connect = []
+        el_state_connect = []
+        for el in previous_splitters:
+            nm = el[1:]
+            st = self.other_states[nm][0]
+            if not st.other_states:
+                # states that has no other connections
+                el_state.append(el)
+            else:  # element has previous_connection
+                if st.current_splitter:  # final?
+                    # states that has previous connections and it's own splitter
+                    el_state_connect.append((el, st.prev_state_splitter))
+                else:
+                    # states with previous connections but no additional splitter
+                    el_connect.append((el, st.prev_state_splitter))
+
+        for el in el_connect:
+            nm = el[0][1:]
+            repeated_prev = set(ensure_list(el[1])).intersection(el_state)
+            if repeated_prev:
+                for r_el in repeated_prev:
+                    r_nm = r_el[1:]
+                    self.other_states[r_nm] = (
+                        self.other_states[r_nm][0],
+                        self.other_states[r_nm][1] + self.other_states[nm][1],
+                    )
+                new_st = set(ensure_list(el[1])) - set(el_state)
+                if not new_st:
+                    previous_splitters.remove(el[0])
+                else:
+                    for n_el in new_st:
+                        n_nm = n_el[1:]
+                        self.other_states[n_nm] = (
+                            self.other_states[nm][0].other_states[n_nm][0],
+                            self.other_states[nm][1],
+                        )
+                    # removing el of the splitter and adding new_st instead
+                    ind = previous_splitters.index(el[0])
+                    if ind == len(previous_splitters) - 1:
+                        previous_splitters = previous_splitters[:-1] + list(new_st)
+                    else:
+                        previous_splitters = (
+                            previous_splitters[:ind]
+                            + list(new_st)
+                            + previous_splitters[ind + 1 :]
+                        )
+        # TODO: this part is not tested, needs more work
+        for el in el_state_connect:
+            repeated_prev = set(ensure_list(el[1])).intersection(el_state)
+            if repeated_prev:
+                for r_el in repeated_prev:
+                    previous_splitters.remove(r_el)
+
+        if len(previous_splitters) == 1:
+            return previous_splitters[0]
+        else:
+            return previous_splitters
+
     def _prevst_current_check(self, splitter_part, check_nested=True):
         """
         Check if splitter_part is purely prev-state part, the current part,
@@ -640,14 +730,15 @@ def prepare_states_ind(self):
         # TODO: need tests in test_Workflow.py
         elements_to_remove = []
         elements_to_remove_comb = []
-        for name, (st, inp) in self.other_states.items():
-            if (
-                f"{self.name}.{inp}" in self.splitter_rpn
-                and f"_{name}" in self.splitter_rpn_compact
-            ):
-                elements_to_remove.append(f"_{name}")
-                if f"{self.name}.{inp}" not in self.combiner:
-                    elements_to_remove_comb.append(f"_{name}")
+        for name, (st, inp_l) in self.other_states.items():
+            for inp in inp_l:
+                if (
+                    f"{self.name}.{inp}" in self.splitter_rpn
+                    and f"_{name}" in self.splitter_rpn_compact
+                ):
+                    elements_to_remove.append(f"_{name}")
+                    if f"{self.name}.{inp}" not in self.combiner:
+                        elements_to_remove_comb.append(f"_{name}")
 
         partial_rpn = hlpst.remove_inp_from_splitter_rpn(
             deepcopy(self.splitter_rpn_compact), elements_to_remove
@@ -770,8 +861,9 @@ def prepare_inputs(self):
             for ii, el in enumerate(self.prev_state_splitter_rpn_compact):
                 if el in ["*", "."]:
                     continue
-                st, inp = self.other_states[el[1:]]
-                if f"{self.name}.{inp}" in self.splitter_rpn:  # inner splitter
+                st, inp_l = self.other_states[el[1:]]
+                inp_l = [f"{self.name}.{inp}" for inp in inp_l]
+                if set(inp_l).intersection(self.splitter_rpn):  # inner splitter
                     connected_to_inner += [
                         el for el in st.splitter_rpn_final if el not in [".", "*"]
                     ]
@@ -784,8 +876,9 @@ def prepare_inputs(self):
                         else:
                             inputs_ind_prev = hlpst.op["*"](inputs_ind_prev, st_ind)
                     else:
-                        inputs_ind_prev = hlpst.op["*"](st_ind)
-                    keys_inp_prev += [f"{self.name}.{inp}"]
+                        # TODO: more tests needed
+                        inputs_ind_prev = hlpst.op["."](*[st_ind] * len(inp_l))
+                    keys_inp_prev += inp_l
             keys_inp = keys_inp_prev + keys_inp
 
             if inputs_ind and inputs_ind_prev:

pydra/engine/tests/test_state.py

@@ -586,6 +586,98 @@ def test_state_connect_6a():
     ]
 
 
+def test_state_connect_7():
+    """two 'connected' states with multiple fields that are connected
+    no explicit splitter for the second state
+    """
+    st1 = State(name="NA", splitter="a")
+    st2 = State(name="NB", other_states={"NA": (st1, ["x", "y"])})
+    # should take into account that x, y come from the same task
+    assert st2.splitter == "_NA"
+    assert st2.splitter_rpn == ["NA.a"]
+    assert st2.prev_state_splitter == st2.splitter
+    assert st2.prev_state_splitter_rpn == st2.splitter_rpn
+    assert st2.current_splitter is None
+    assert st2.current_splitter_rpn == []
+
+    st2.prepare_states(inputs={"NA.a": [3, 5]})
+    assert st2.group_for_inputs_final == {"NA.a": 0}
+    assert st2.groups_stack_final == [[0]]
+    assert st2.states_ind == [{"NA.a": 0}, {"NA.a": 1}]
+    assert st2.states_val == [{"NA.a": 3}, {"NA.a": 5}]
+
+    st2.prepare_inputs()
+    # since x,y come from the same state, they should have the same index
+    assert st2.inputs_ind == [{"NB.x": 0, "NB.y": 0}, {"NB.x": 1, "NB.y": 1}]
+
+
+def test_state_connect_8():
+    """three 'connected' states: NA -> NB -> NC; NA -> NC (only NA has its own splitter)
+    pydra should recognize, that there is only one splitter - NA
+    and it should give the same as the previous test
+    """
+    st1 = State(name="NA", splitter="a")
+    st2 = State(name="NB", other_states={"NA": (st1, "b")})
+    st3 = State(name="NC", other_states={"NA": (st1, "x"), "NB": (st2, "y")})
+    # x comes from NA and y comes from NB, but NB has only NA's splitter,
+    # so it should be treated as both inputs are from NA state
+    assert st3.splitter == "_NA"
+    assert st3.splitter_rpn == ["NA.a"]
+    assert st3.prev_state_splitter == st3.splitter
+    assert st3.prev_state_splitter_rpn == st3.splitter_rpn
+    assert st3.current_splitter is None
+    assert st3.current_splitter_rpn == []
+
+    st3.prepare_states(inputs={"NA.a": [3, 5]})
+    assert st3.group_for_inputs_final == {"NA.a": 0}
+    assert st3.groups_stack_final == [[0]]
+    assert st3.states_ind == [{"NA.a": 0}, {"NA.a": 1}]
+    assert st3.states_val == [{"NA.a": 3}, {"NA.a": 5}]
+
+    st3.prepare_inputs()
+    # since x,y come from the same state (although y indirectly), they should have the same index
+    assert st3.inputs_ind == [{"NC.x": 0, "NC.y": 0}, {"NC.x": 1, "NC.y": 1}]
+
+
+@pytest.mark.xfail(
+    reason="doesn't recognize that NC.y has 4 elements (not independend on NC.x)"
+)
+def test_state_connect_9():
+    """four  'connected' states: NA1 -> NB; NA2 -> NB, NA1 -> NC; NB -> NC
+    pydra should recognize, that there is only one splitter - NA_1 and NA_2
+
+    """
+    st1 = State(name="NA_1", splitter="a")
+    st1a = State(name="NA_2", splitter="a")
+    st2 = State(name="NB", other_states={"NA_1": (st1, "b"), "NA_2": (st1a, "c")})
+    st3 = State(name="NC", other_states={"NA_1": (st1, "x"), "NB": (st2, "y")})
+    # x comes from NA_1 and y comes from NB, but NB has only NA_1/2's splitters,
+    assert st3.splitter == ["_NA_1", "_NA_2"]
+    assert st3.splitter_rpn == ["NA_1.a", "NA_2.a", "*"]
+    assert st3.prev_state_splitter == st3.splitter
+    assert st3.prev_state_splitter_rpn == st3.splitter_rpn
+    assert st3.current_splitter is None
+    assert st3.current_splitter_rpn == []
+
+    st3.prepare_states(inputs={"NA_1.a": [3, 5], "NA_2.a": [11, 12]})
+    assert st3.group_for_inputs_final == {"NA_1.a": 0, "NA_2.a": 1}
+    assert st3.groups_stack_final == [[0, 1]]
+    assert st3.states_ind == [
+        {"NA_1.a": 0, "NA_2.a": 0},
+        {"NA_1.a": 0, "NA_2.a": 1},
+        {"NA_1.a": 1, "NA_2.a": 0},
+        {"NA_1.a": 1, "NA_2.a": 1},
+    ]
+
+    st3.prepare_inputs()
+    assert st3.inputs_ind == [
+        {"NC.x": 0, "NC.y": 0},
+        {"NC.x": 0, "NC.y": 1},
+        {"NC.x": 1, "NC.y": 2},
+        {"NC.x": 1, "NC.y": 3},
+    ]
+
+
 def test_state_connect_innerspl_1():
     """two 'connected' states: testing groups, prepare_states and prepare_inputs,
     the second state has an inner splitter, full splitter provided
@@ -605,7 +697,7 @@ def test_state_connect_innerspl_1():
         inputs={"NA.a": [3, 5], "NB.b": [[1, 10, 100], [2, 20, 200]]},
         cont_dim={"NB.b": 2},  # will be treated as 2d container
     )
-    assert st2.other_states["NA"][1] == "b"
+    assert st2.other_states["NA"][1] == ["b"]
     assert st2.group_for_inputs_final == {"NA.a": 0, "NB.b": 1}
     assert st2.groups_stack_final == [[0], [1]]
 
@@ -653,7 +745,7 @@ def test_state_connect_innerspl_1a():
     assert st2.current_splitter == "NB.b"
     assert st2.current_splitter_rpn == ["NB.b"]
 
-    assert st2.other_states["NA"][1] == "b"
+    assert st2.other_states["NA"][1] == ["b"]
 
     st2.prepare_states(
         inputs={"NA.a": [3, 5], "NB.b": [[1, 10, 100], [2, 20, 200]]},
@@ -717,7 +809,7 @@ def test_state_connect_innerspl_2():
         inputs={"NA.a": [3, 5], "NB.b": [[1, 10, 100], [2, 20, 200]], "NB.c": [13, 17]},
         cont_dim={"NB.b": 2},  # will be treated as 2d container
     )
-    assert st2.other_states["NA"][1] == "b"
+    assert st2.other_states["NA"][1] == ["b"]
     assert st2.group_for_inputs_final == {"NA.a": 0, "NB.c": 1, "NB.b": 2}
     assert st2.groups_stack_final == [[0], [1, 2]]
 
@@ -778,7 +870,7 @@ def test_state_connect_innerspl_2a():
 
     assert st2.splitter == ["_NA", ["NB.b", "NB.c"]]
     assert st2.splitter_rpn == ["NA.a", "NB.b", "NB.c", "*", "*"]
-    assert st2.other_states["NA"][1] == "b"
+    assert st2.other_states["NA"][1] == ["b"]
 
     st2.prepare_states(
         inputs={"NA.a": [3, 5], "NB.b": [[1, 10, 100], [2, 20, 200]], "NB.c": [13, 17]},
@@ -839,6 +931,7 @@ def test_state_connect_innerspl_3():
     the second state has one inner splitter and one 'normal' splitter
     the prev-state parts of the splitter have to be added
     """
+
     st1 = State(name="NA", splitter="a")
     st2 = State(name="NB", splitter=["c", "b"], other_states={"NA": (st1, "b")})
     st3 = State(name="NC", splitter="d", other_states={"NB": (st2, "a")})
@@ -986,8 +1079,8 @@ def test_state_connect_innerspl_4():
 
     assert st3.splitter == [["_NA", "_NB"], "NC.d"]
     assert st3.splitter_rpn == ["NA.a", "NB.b", "NB.c", "*", "*", "NC.d", "*"]
-    assert st3.other_states["NA"][1] == "e"
-    assert st3.other_states["NB"][1] == "f"
+    assert st3.other_states["NA"][1] == ["e"]
+    assert st3.other_states["NB"][1] == ["f"]
 
     st3.prepare_states(
         inputs={
@@ -1736,12 +1829,12 @@ def test_connect_splitters_exception_1(splitter, other_states):
 
 
 def test_connect_splitters_exception_2():
-    st = State(
-        name="CN",
-        splitter="_NB",
-        other_states={"NA": (State(name="NA", splitter="a"), "b")},
-    )
     with pytest.raises(PydraStateError) as excinfo:
+        st = State(
+            name="CN",
+            splitter="_NB",
+            other_states={"NA": (State(name="NA", splitter="a"), "b")},
+        )
         st.set_input_groups()
     assert "can't ask for splitter from NB" in str(excinfo.value)