auto
auto in scan, keyword
Within scan statement, the keyword auto refers implicitely to the primary dimension of the table being enumerated.
table T = extend.range(6)
x = 0
T.X = each T scan auto
keep x
x = T.N - x
return x
show table "T" a1b5 with T.N, T.X
In the above script, auto refers to the primary dimension of T. Instead of using auto, we could explicitly give the primary dimension a name, say t, and use it as follows:
table T[t] = extend.range(6)
x = 0
T.X = each T scan t
keep x
x = T.N - x
return x
show table "T" a1b5 with T.N, T.X
Both scripts produce the following table:
| N | X |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 2 |
| 5 | 3 |
| 6 | 3 |
auto in autodiff, keyword
Within an autodiff block, the keyword auto indicates that a parameter is randomly inialized as a normal distribution of mean 1 and of sigma 0.1.
table T = with
[| as X, as Y |]
[| 1, 3.1 |]
[| 2, 3.9 |]
[| 3, 5.1 |]
[| 4, 6.0 |]
autodiff T with
params a auto
params b auto
Delta = a * T.X + b - T.Y
return Delta^2
show scalar "Learned" a1c1 with "y ≈ \{a} x + \{b}"