}
	n := 0
	for {
		i := Index(s, sep)
		if i == -1 {
			return n
		}
		n++
		s = s[i+len(sep):]
	}
}

// Contains reports whether subslice is within b.
func Contains(b, subslice []byte) bool {
	return Index(b, subslice) != -1
}

// ContainsAny reports whether any of the UTF-8-encoded code points in chars are within b.
func ContainsAny(b []byte, chars string) bool {
	return IndexAny(b, chars) >= 0

}

var containsTests = []struct {
	b, subslice []byte
	want        bool
}{
	{[]byte("hello"), []byte("hel"), true},
	{[]byte("日本語"), []byte("日本"), true},
	{[]byte("hello"), []byte("Hello, world"), false},
	{[]byte("東京"), []byte("京東"), false},
}

func TestContains(t *testing.T) {
	for _, tt := range containsTests {
		if got := Contains(tt.b, tt.subslice); got != tt.want {

    *   Allow subslicing Tensors with a single dimension.
    *   Add option to calculate string length in Unicode characters.
    *   Add functionality to SubSlice a tensor.
    *   Add searchsorted (ie lower/upper_bound) op.
    *   Add model explainability to Boosted Trees.
    *   Support negative positions for tf.substr.