simplify test, add comment, change function name

python/pylibcugraph/pylibcugraph/edge_id_lookup_table.pyx

@@ -77,7 +77,7 @@ cdef class EdgeIdLookupTable:
         if self.lookup_container_c_ptr is not NULL:
             cugraph_lookup_container_free(self.lookup_container_c_ptr)
 
-    def find(
+    def lookup_vertex_ids(
         self,
         edge_ids,
         int edge_type

python/pylibcugraph/pylibcugraph/tests/test_lookup_table.py

@@ -12,7 +12,6 @@
 # limitations under the License.
 
 import cupy
-import numpy as np
 
 from pylibcugraph import (
     SGGraph,
@@ -34,43 +33,24 @@
 
 
 def test_lookup_table():
-
+    # Vertex id array
     vtcs = cupy.arange(6, dtype="int64")
-    vtps = np.array([0, 0, 1, 1, 2, 2])
-
-    e_lookup = {
-        (0, 0): [0, 0],
-        (0, 1): [1, 0],
-        (0, 2): [2, 0],
-        (1, 0): [3, 0],
-        (1, 1): [4, 0],
-        (1, 2): [5, 0],
-        (2, 0): [6, 0],
-        (2, 1): [7, 0],
-        (2, 2): [8, 0],
-    }
-
-    srcs = np.array([0, 1, 5, 4, 3, 2, 2, 0, 5, 4, 4, 5])
-    dsts = np.array([1, 5, 0, 3, 2, 1, 3, 3, 2, 3, 1, 4])
-    wgts = cupy.ones((len(srcs),), dtype="float32")
 
-    eids = []
-    etps = []
-    for i in range(len(srcs)):
-        key = (int(vtps[srcs[i]]), int(vtps[dsts[i]]))
-        etps.append(e_lookup[key][0])
-        eids.append(e_lookup[key][1])
+    # Edge ids are unique per edge type and start from 0
+    # Each edge type has the same src/dst vertex type here,
+    # just as it would in a GNN application.
+    srcs = cupy.array([0, 1, 5, 4, 3, 2, 2, 0, 5, 4, 4, 5])
+    dsts = cupy.array([1, 5, 0, 3, 2, 1, 3, 3, 2, 3, 1, 4])
+    etps = cupy.array([0, 2, 6, 7, 4, 3, 4, 1, 7, 7, 6, 8], dtype="int32")
+    eids = cupy.array([0, 0, 0, 0, 0, 0, 1, 0, 1, 2, 1, 0])
 
-        e_lookup[key][1] += 1
-
-    eids = cupy.array(eids)
-    etps = cupy.array(etps, dtype="int32")
+    wgts = cupy.ones((len(srcs),), dtype="float32")
 
     graph = SGGraph(
         resource_handle=ResourceHandle(),
         graph_properties=GraphProperties(is_symmetric=False, is_multigraph=True),
-        src_or_offset_array=cupy.array(srcs),
-        dst_or_index_array=cupy.array(dsts),
+        src_or_offset_array=srcs,
+        dst_or_index_array=dsts,
         vertices_array=vtcs,
         weight_array=wgts,
         edge_id_array=eids,
@@ -84,15 +64,15 @@ def test_lookup_table():
 
     assert table is not None
 
-    found_edges = table.find(cupy.array([0, 1, 2, 3, 4]), 7)
+    found_edges = table.lookup_vertex_ids(cupy.array([0, 1, 2, 3, 4]), 7)
     assert (found_edges["sources"] == cupy.array([4, 5, 4, -1, -1])).all()
     assert (found_edges["destinations"] == cupy.array([3, 2, 3, -1, -1])).all()
 
-    found_edges = table.find(cupy.array([0]), 5)
+    found_edges = table.lookup_vertex_ids(cupy.array([0]), 5)
     assert (found_edges["sources"] == cupy.array([-1])).all()
     assert (found_edges["destinations"] == cupy.array([-1])).all()
 
-    found_edges = table.find(cupy.array([3, 1, 0, 5]), 6)
+    found_edges = table.lookup_vertex_ids(cupy.array([3, 1, 0, 5]), 6)
     assert (found_edges["sources"] == cupy.array([-1, 4, 5, -1])).all()
     assert (found_edges["destinations"] == cupy.array([-1, 1, 0, -1])).all()