Average Error: 3.7 → 2.8
Time: 24.8s
Precision: 64
Internal Precision: 128
\[\left(a + \left(b + \left(c + d\right)\right)\right) \cdot 2\]
↓
\[2 \cdot \left(\left(\left(b + c\right) + d\right) + a\right)\]

Error

Bits error versus a

Bits error versus b

Bits error versus c

Bits error versus d

Try it out

Your Program's Arguments

Results

Enter valid numbers for all inputs

Target

Original3.7
Target3.9
Herbie2.8
\[\left(a + b\right) \cdot 2 + \left(c + d\right) \cdot 2\]

Derivation

  1. Initial program 3.7

    \[\left(a + \left(b + \left(c + d\right)\right)\right) \cdot 2\]
  2. Using strategy rm

  3. Applied associate-+r+2.8

    \[\leadsto \left(a + \color{blue}{\left(\left(b + c\right) + d\right)}\right) \cdot 2\]

  4. Final simplification2.8

    \[\leadsto 2 \cdot \left(\left(\left(b + c\right) + d\right) + a\right)\]

Reproduce

herbie shell --seed 2019010 
(FPCore (a b c d)
  :name "Expression, p6"
  :pre (and (<= -14 a -13) (<= -3 b -2) (<= 3 c 3.5) (<= 12.5 d 13.5))

  :herbie-target
  (+ (* (+ a b) 2) (* (+ c d) 2))

  (* (+ a (+ b (+ c d))) 2))

Details

Time bar (total: 21.3s)Debug log

sample53.0ms

Algorithm
intervals

simplify182.0ms

Counts
1 → 1
Calls
1 calls:
Slowest
182.0ms
(* (+ a (+ b (+ c d))) 2)

prune11.0ms

Pruning

1 alts after pruning (1 fresh and 0 done)

Merged error: 3.5b

localize25.0ms

Local error

Found 2 expressions with local error:

2.7b
(+ a (+ b (+ c d)))
0.4b
(+ b (+ c d))

rewrite4.0ms

Algorithm
rewrite-expression-head
Rules
2×add-log-exp
2×flip-+
2×add-cube-cbrt
2×add-exp-log
2×add-cbrt-cube
2×flip3-+
2×*-un-lft-identity
2×associate-+r+
2×+-commutative
2×pow1
2×add-sqr-sqrt
Counts
2 → 22
Calls
2 calls:
Slowest
2.0ms
(+ a (+ b (+ c d)))
1.0ms
(+ b (+ c d))

series32.0ms

Counts
2 → 6
Calls
2 calls:
Slowest
22.0ms
(+ a (+ b (+ c d)))
10.0ms
(+ b (+ c d))

simplify54.0ms

Counts
7 → 28
Calls
7 calls:
Slowest
12.0ms
(+ b (+ c d))
11.0ms
(+ b (+ c d))
9.0ms
(+ b (+ c d))
9.0ms
(+ b (+ c d))
6.0ms
(+ b (+ c d))

prune245.0ms

Pruning

8 alts after pruning (8 fresh and 0 done)

Merged error: 2.3b

localize10.0ms

Local error

Found 1 expressions with local error:

2.7b
(+ a (+ (+ b c) d))

rewrite3.0ms

Algorithm
rewrite-expression-head
Rules
1×add-log-exp
1×flip-+
1×add-cube-cbrt
1×add-exp-log
1×add-cbrt-cube
1×flip3-+
1×*-un-lft-identity
1×associate-+r+
1×+-commutative
1×pow1
1×add-sqr-sqrt
Counts
1 → 11
Calls
1 calls:
Slowest
3.0ms
(+ a (+ (+ b c) d))

series35.0ms

Counts
1 → 3
Calls
1 calls:
Slowest
35.0ms
(+ a (+ (+ b c) d))

simplify20.0ms

Counts
3 → 14
Calls
3 calls:
Slowest
7.0ms
(+ b (+ c d))
6.0ms
(+ a (+ b c))
6.0ms
(+ b (+ c d))

prune147.0ms

Pruning

12 alts after pruning (11 fresh and 1 done)

Merged error: 2.0b

localize22.0ms

Local error

Found 4 expressions with local error:

2.7b
(+ a (+ (+ b c) d))
2.7b
(+ a (+ (+ b c) d))
2.7b
(+ a (+ (+ b c) d))
0.7b
(cbrt (* (* (+ a (+ (+ b c) d)) (+ a (+ (+ b c) d))) (+ a (+ (+ b c) d))))

rewrite24.0ms

Algorithm
rewrite-expression-head
Rules
30×flip-+
30×flip3-+
28×frac-times
26×cbrt-div
14×associate-*l/
8×associate-*r/
4×add-log-exp
4×add-cube-cbrt
4×add-exp-log
4×add-cbrt-cube
4×*-un-lft-identity
4×pow1
4×add-sqr-sqrt
3×associate-+r+
3×+-commutative
1×rem-cbrt-cube
1×pow3
1×pow1/3
1×cbrt-prod
Counts
4 → 69
Calls
4 calls:
Slowest
15.0ms
(cbrt (* (* (+ a (+ (+ b c) d)) (+ a (+ (+ b c) d))) (+ a (+ (+ b c) d))))
3.0ms
(+ a (+ (+ b c) d))
3.0ms
(+ a (+ (+ b c) d))
3.0ms
(+ a (+ (+ b c) d))

series190.0ms

Counts
4 → 12
Calls
4 calls:
Slowest
82.0ms
(cbrt (* (* (+ a (+ (+ b c) d)) (+ a (+ (+ b c) d))) (+ a (+ (+ b c) d))))
47.0ms
(+ a (+ (+ b c) d))
35.0ms
(+ a (+ (+ b c) d))
27.0ms
(+ a (+ (+ b c) d))

simplify7.2s

Counts
39 → 81
Calls
39 calls:
Slowest
933.0ms
(cbrt (* (+ a (+ (+ b c) d)) (+ a (+ (+ b c) d))))
572.0ms
(cbrt (* (* (+ a (+ (+ b c) d)) (+ (pow a 3) (pow (+ (+ b c) d) 3))) (+ a (+ (+ b c) d))))
378.0ms
(cbrt (* (* (+ a (+ (+ b c) d)) (+ (pow a 3) (pow (+ (+ b c) d) 3))) (+ (pow a 3) (pow (+ (+ b c) d) 3))))
348.0ms
(cbrt (* (* (- (* a a) (* (+ (+ b c) d) (+ (+ b c) d))) (+ a (+ (+ b c) d))) (+ (pow a 3) (pow (+ (+ b c) d) 3))))
303.0ms
(cbrt (* (* (- (* a a) (* (+ (+ b c) d) (+ (+ b c) d))) (+ a (+ (+ b c) d))) (+ a (+ (+ b c) d))))

prune1.1s

Pruning

26 alts after pruning (25 fresh and 1 done)

Merged error: 1.7b

localize13.0ms

Local error

Found 4 expressions with local error:

2.7b
(+ a (+ (+ b c) d))
2.7b
(+ a (+ (+ b c) d))
2.7b
(+ (+ a (+ b c)) d)
0.7b
(cbrt (* (* (+ a (+ (+ b c) d)) (+ a (+ (+ b c) d))) (+ (+ a (+ b c)) d)))

rewrite29.0ms

Algorithm
rewrite-expression-head
Rules
30×flip-+
30×flip3-+
28×frac-times
26×cbrt-div
14×associate-*l/
8×associate-*r/
4×add-log-exp
4×add-cube-cbrt
4×add-exp-log
4×add-cbrt-cube
4×*-un-lft-identity
4×pow1
4×add-sqr-sqrt
3×+-commutative
2×associate-+r+
1×pow1/3
1×associate-+l+
1×cbrt-prod
Counts
4 → 68
Calls
4 calls:
Slowest
19.0ms
(cbrt (* (* (+ a (+ (+ b c) d)) (+ a (+ (+ b c) d))) (+ (+ a (+ b c)) d)))
4.0ms
(+ (+ a (+ b c)) d)
3.0ms
(+ a (+ (+ b c) d))
3.0ms
(+ a (+ (+ b c) d))

series157.0ms

Counts
4 → 12
Calls
4 calls:
Slowest
92.0ms
(cbrt (* (* (+ a (+ (+ b c) d)) (+ a (+ (+ b c) d))) (+ (+ a (+ b c)) d)))
25.0ms
(+ (+ a (+ b c)) d)
20.0ms
(+ a (+ (+ b c) d))
19.0ms
(+ a (+ (+ b c) d))

simplify7.2s

Counts
39 → 80
Calls
39 calls:
Slowest
889.0ms
(cbrt (* (+ a (+ (+ b c) d)) (+ a (+ (+ b c) d))))
352.0ms
(cbrt (* (* (+ (pow a 3) (pow (+ (+ b c) d) 3)) (+ a (+ (+ b c) d))) (+ (+ a (+ b c)) d)))
345.0ms
(cbrt (* (* (- (* a a) (* (+ (+ b c) d) (+ (+ b c) d))) (+ (pow a 3) (pow (+ (+ b c) d) 3))) (+ (+ a (+ b c)) d)))
345.0ms
(cbrt (* (* (- (* a a) (* (+ (+ b c) d) (+ (+ b c) d))) (+ (pow a 3) (pow (+ (+ b c) d) 3))) (+ (pow (+ a (+ b c)) 3) (pow d 3))))
341.0ms
(cbrt (* (* (+ a (+ (+ b c) d)) (+ (pow a 3) (pow (+ (+ b c) d) 3))) (+ (pow (+ a (+ b c)) 3) (pow d 3))))

prune1.1s

Pruning

29 alts after pruning (28 fresh and 1 done)

Merged error: 1.4b

regimes1.8s

Accuracy

0% (1.3b remaining)

Error of 2.8b against oracle of 1.5b and baseline of 2.8b

bsearch2.0ms

end0.0ms

sample1.6s

Algorithm
intervals