isSpace = unicode.IsSpace(r)
			}
			if isSpace {
				if start >= 0 {
					if !yield(s[start:i:i]) {
						return
					}
					start = -1
				}
			} else if start < 0 {
				start = i
			}
			i += size
		}
		if start >= 0 {
			yield(s[start:len(s):len(s)])
		}
	}
}

// FieldsFuncSeq returns an iterator over subslices of s split around runs of

	if atEOF {
		return len(data), dropCR(data), nil
	}
	// Request more data.
	return 0, nil, nil
}

// isSpace reports whether the character is a Unicode white space character.
// We avoid dependency on the unicode package, but check validity of the implementation
// in the tests.
func isSpace(r rune) bool {
	if r <= '\u00FF' {
		// Obvious ASCII ones: \t through \r plus space. Plus two Latin-1 oddballs.
		switch r {

        dispatches the best kernel implementation based on CPU vector
        architecture. To disable them, build with
        `--define=tensorflow_mkldnn_contraction_kernel=0`.
    *   `tf.linspace(start, stop, num)` now always uses "stop" as last value
        (for num > 1)
    *   Added top-k to precision and recall to keras metrics.
    *   Add a ragged size op and register it to the op dispatcher

			}
		}
	}
}

type predicate struct {
	f    func(r rune) bool
	name string
}

var isSpace = predicate{unicode.IsSpace, "IsSpace"}
var isDigit = predicate{unicode.IsDigit, "IsDigit"}
var isUpper = predicate{unicode.IsUpper, "IsUpper"}
var isValidRune = predicate{
	func(r rune) bool {
		return r != utf8.RuneError
	},

	setBits := uint8(0)
	for i := 0; i < len(s); i++ {
		r := s[i]
		setBits |= r
		isSpace := int(asciiSpace[r])
		n += wasSpace & ^isSpace
		wasSpace = isSpace
	}

	if setBits >= utf8.RuneSelf {
		// Some runes in the input slice are not ASCII.
		return FieldsFunc(s, unicode.IsSpace)
	}

	// ASCII fast path
	a := make([][]byte, n)
	na := 0
	fieldStart := 0
	i := 0

			i++
		}

		// Trim whitespace of segment
		segmentStart, segmentEnd := start, i
		for segmentStart < segmentEnd && unicode.IsSpace(rune(path[segmentStart])) {
			segmentStart++
		}
		for segmentEnd > segmentStart && unicode.IsSpace(rune(path[segmentEnd-1])) {
			segmentEnd--
		}

		// Check for ".." or "."
		switch {

// in http://docs.aws.amazon.com/general/latest/gr/sigv4-create-canonical-request.html
func signV4TrimAll(input string) string {
	// Compress adjacent spaces (a space is determined by
	// unicode.IsSpace() internally here) to one space and return
	return strings.Join(strings.Fields(input), " ")
}

// checkMetaHeaders will check if the metadata from header/url is the same with the one from signed headers

	// "of"
	// "spaces"
}

func ExampleFieldsFuncSeq() {
	text := []byte("The quick brown fox")
	fmt.Println("Split on whitespace(similar to FieldsSeq):")
	for word := range bytes.FieldsFuncSeq(text, unicode.IsSpace) {
		fmt.Printf("%q\n", word)
	}

	mixedText := []byte("abc123def456ghi")
	fmt.Println("\nSplit on digits:")
	for word := range bytes.FieldsFuncSeq(mixedText, unicode.IsDigit) {
		fmt.Printf("%q\n", word)