**Redis ML Commands**

**Decision tree ensembles**

### Example of use

The following creates a random forest under the key `myforest`

that consists of three trees with ids ranging from 0 to 2, where each consists of a single numeric splitter and its predicate values. Afterwards, the forest is used to classify two inputs and yield their predictions.

```
redis> ML.FOREST.ADD myforst 0 . NUMERIC 1 0.1 .l LEAF 1 .r LEAF 0
OK
redis> ML.FOREST.ADD myforst 1 . NUMERIC 1 0.1 .l LEAF 1 .r LEAF 0
OK
redis> ML.FOREST.ADD myforst 2 . NUMERIC 1 0.1 .l LEAF 0 .r LEAF 1
OK
redis> ML.FOREST.RUN myforst 1:0.01 CLASSIFICATION
"1"
redis> ML.FOREST.RUN myforst 1:0.2 CLASSIFICATION
"0"
```

### ML.FOREST.ADD

Available since 1.0.0.

Time complexity:O(M*log(N)) where N is the tree's depth and M is the number of nodes added

#### Syntax

```
ML.FOREST.ADD key tree path ((NUMERIC|CATEGORIC) attr val | LEAF val [STATS]) [...]
```

#### Description

Add nodes to a tree in the forest.
This command adds one or more nodes to the tree in the forest that's stored under `key`

. Trees are identified by numeric ids, `treeid`

, that must begin at 0 and incremented by exactly 1 for each new tree.

Each of the nodes is described by its path and definition. The `path`

argument is the path from the tree's root to the node. A valid path always starts with the period character (`.`

), which denotes the root. Optionally, the root may be followed by left or right branches ,denoted by the characters `l`

and `r`

, respectively. For example, the path *".lr"* refers to the right child of the root's left child.

A node in the decision tree can either be a splitter or a terminal leaf. Splitter nodes are either numerical or categorical, and are added using the `NUMERIC`

or `CATEGORIC`

keywords. Splitter nodes also require specifying the examined attribute (`attr`

) as well as the value (`val`

) used in the comparison made during the branching decision. `val`

is expected to be a double-precision floating point value for numerical splitters, and a string for categorical splitter nodes.

The leaves are created with the `LEAF`

keyword and only require specifying their double-precision floating point value (`val`

).

#### Return value:

Simple string reply

### ML.FOREST.RUN

Available since 1.0.0.

Time complexity:O(M*log(N)) where N is the depth of the trees and M is the number of trees in the forest

#### Syntax

```
ML.FOREST.RUN key sample (CLASSIFICATION|REGRESSION)
```

#### Description

Predicts the classified (discrete) or regressed (continuous) value of a sample using the forest.
The forest that's stored in `key`

is used for generating the predicted value for the `sample`

. The sample is given as a string that is a vector of attribute-value pairs in the format of `attr:val`

. For example, the `sample`

*"gender:male"* has a single attribute, *gender*, whose value is *male*. A sample may have multiple such attribute-value pairs, and these must be comma-separated (`,`

) in the string vector. For example, a sample of a 25 years old male is expressed as *"gender:male,age:25"*.

#### Return value:

Bulk string reply: the predicted value of the sample

**Linear regression**

### Example of use

The first line of the example shows how a linear regression predictor is set to the key named `linear`

. The predictor has an intercept of 2 and its coefficients are 3, 4 and 5. Once the predicator is ready, it is used to predict the result given the independent variables' values (features) of 1, 1 and 1.

```
redis> ML.LINREG.SET linear 2 3 4 5
OK
redis> ML.LINREG.PREDICT linear 1 1 1
"14"
```

### ML.LINREG.SET

Available since 1.0.0.

Time complexity:O(N) where N is the number of coefficients

#### Syntax

```
ML.LINREG.SET key intercept coefficient [...]
```

#### Description

Sets a linear regression predictor.
This command creates or updates the linear regression predictor that's stored in `key`

. The predictor's intercept is specified by `intercept`

, followed by one or more `coefficient`

arguments of the independent variables.

#### Return value:

Simple string reply

### ML.LINREG.PREDICT

Available since 1.0.0.

Time complexity:O(N) where N is the number features

#### Syntax

```
ML.LINREG.PREDICT key feature [...]
```

#### Description

Predicts the result for a set of features.
The linear regression predictor stored in `key`

is used for predicting the result based on one or more features that are given by the `feature`

argument(s).

#### Return value:

Bulk string reply: the predicted result for the feature set

**Logistic regression**

### Example of use

In this example, the first line shows how a logistic regression predictor is set to the key named `logistic`

. The predictor has an intercept of 0 and its coefficients are 2 and 2. Once the predicator is ready, it is used to predict the result given the independent variables' values (features) of -3 and 1.

```
redis> ML.LOGREG.SET logistic 0 2 2
OK
redis> ML.LOGREG.PREDICT logistic -3 1
"0.017986209962091559"
```

### ML.LOGREG.SET

Available since 1.0.0.

Time complexity:O(N) where N is the number of coefficients

#### Syntax

```
ML.LOGREG.SET key intercept coefficient [...]
```

#### Description

Sets a linear regression predictor.
This command sets or updates the logistic regression predictor that's stored in `key`

. The predictor's intercept is specified by `intercept`

, followed by one or more `coefficient`

arguments of the independent variables.

#### Return value:

Simple string reply

### ML.LOGREG.PREDICT

Available since 1.0.0.

Time complexity:O(N) where N is the number features

#### Syntax

```
ML.LOGREG.PREDICT key feature [...]
```

#### Description

Predicts the result for a set of features.
The logistic regression predictor stored in `key`

is used for predicting the result based on one or more features that are given by the `feature`

argument(s).

#### Return value:

Bulk string reply: the predicted result for the feature set

**Matrix operations**

#### Example of use

The following example shows how to set two matrices, `a`

and `b`

, and then multiply them storing the result in the matrix `ab`

. Lastly, the contents of `ab`

are fetched.

```
redis> ML.MATRIX.SET a 2 3 1 2 5 3 4 6
OK
redis> ML.MATRIX.SET b 3 2 1 2 3 4 7 1
OK
redis> ML.MATRIX.MULTIPLY a b ab
OK
redis> ML.MATRIX.GET ab
1) (integer) 2
2) (integer) 2
3) "42"
4) "15"
5) "57"
6) "28"
```

### ML.MATRIX.SET

Available since 1.0.0.

Time complexity:O(N*M) where N is the number of rows and M is the number of columns

#### Syntax

```
ML.MATRIX.SET key n m entry11 .. entrynm
```

#### Description

Sets a matrix.
Sets `key`

to store a matrix of `n`

rows,`m`

columns and double-precision float entries ranging from `entry11`

to `entrynm`

.

#### Return value:

Simple string reply

### ML.MATRIX.GET

Available since 1.0.0.

Time complexity:O(N*M) where N is the number of rows and M is the number of columns

#### Syntax

```
ML.MATRIX.GET key
```

#### Description

Get a matrix. Returns the matrix's dimensions and entries.

#### Return value:

Array reply. The first two elements are the matrix's rows and columns, respectively, followed by the entries.

### ML.MATRIX.ADD

Available since 1.0.0.

Time complexity:O(N*M) where N is the number of rows and M is the number of columns

#### Syntax

```
ML.MATRIX.ADD matrix1 matrix2 sum
```

#### Description

Adds matrices.
The result of adding the two matrices stored in `matrix1`

and `matrix2`

is set in `sum`

.

#### Return value:

Simple string reply

### ML.MATRIX.MULTIPLY

Available since 1.0.0.

Time complexity:O(N*M*P) where N and M are numbers of rows and columns in`matrix1`

, and P is the number of columns in`matrix2`

#### Syntax

```
ML.MATRIX.MULTIPLY matrix1 matrix2 product
```

#### Description

Multiplies matrices.
The result of multiplying the two matrices stored in `matrix1`

and `matrix2`

is set in `product`

.

#### Return value:

Simple string reply

### ML.MATRIX.SCALE

Available since 1.0.0.

Time complexity:O(N*M) where N is the number of rows and M is the number of columns

#### Syntax

```
ML.MATRIX.SCALE key scalar
```

#### Description

Scales a matrix.
Updates the entries of the matrix stored in `key`

by multiplying them with `scalar`

.

#### Return value:

Simple string reply