update dimension range of diskann. (#26405)

Signed-off-by: cqy123456 <qianya.cheng@zilliz.com>

pkg/util/indexparamcheck/constraints.go

@@ -20,11 +20,6 @@ const (
 	// DefaultMaxDim is the largest dimension supported in Milvus
 	DefaultMaxDim = 32768
 
-	// If Dim = 32 and raw vector data = 2G, query node need ~17G disk space When loading the vectors' disk index
-	// If Dim = 2, and raw vector data = 2G, query node need ~60G disk space When loading the vectors' disk index
-	// So DiskAnnMinDim should be greater than or equal to 8 to avoid running out of disk space
-	DiskAnnMinDim = 8
-
 	HNSWMinEfConstruction = 8
 	HNSWMaxEfConstruction = 512
 	HNSWMinM              = 4

pkg/util/indexparamcheck/diskann_checker.go

@@ -9,13 +9,6 @@ func (c diskannChecker) StaticCheck(params map[string]string) error {
 	return c.staticCheck(params)
 }
 
-func (c diskannChecker) CheckTrain(params map[string]string) error {
-	if !CheckIntByRange(params, DIM, DiskAnnMinDim, DefaultMaxDim) {
-		return errOutOfRange(DIM, DiskAnnMinDim, DefaultMaxDim)
-	}
-	return c.StaticCheck(params)
-}
-
 func newDiskannChecker() IndexChecker {
 	return &diskannChecker{}
 }

pkg/util/indexparamcheck/diskann_checker_test.go

@@ -23,7 +23,7 @@ func Test_diskannChecker_CheckTrain(t *testing.T) {
 	}
 
 	invalidParamsSmallDim := copyParams(validParams)
-	invalidParamsSmallDim[DIM] = strconv.Itoa(4)
+	invalidParamsSmallDim[DIM] = strconv.Itoa(0)
 
 	p1 := map[string]string{
 		DIM:    strconv.Itoa(128),

tests/python_client/testcases/test_index.py

@@ -1880,6 +1880,7 @@ class TestIndexDiskann(TestcaseBase):
         for t in threads:
             t.join()
 
+    @pytest.mark.skip(reason = "diskann dim range is set to be [1, 32768)")
     @pytest.mark.tags(CaseLabel.L1)
     @pytest.mark.parametrize("dim", [1, 2, 4, 6])
     def test_create_index_with_small_dim(self, dim):