AI-generated Key Takeaways
-
A ConfusionMatrix is created from a square, 2D array of integers where rows represent actual values and columns represent predicted values.
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The
orderparameter can be used to specify custom class labels for the rows and columns. -
If the
orderparameter is not specified, the class labels are assumed to be a 0-based sequence.
| Usage | Returns |
|---|---|
ee.ConfusionMatrix(array, order
)
|
ConfusionMatrix |
| Argument | Type | Details |
|---|---|---|
array
|
Object | A square, 2D array of integers, representing the confusion matrix. Note that unlike the ee.Array constructor, this argument cannot take a list. |
order
|
List, default: null | The row and column size and order, for non-contiguous or non-zero based matrices. |
Examples
Code Editor (JavaScript)
// A confusion matrix. Rows correspond to actual values, columns to // predicted values. var array = ee . Array ([[ 32 , 0 , 0 , 0 , 1 , 0 ], [ 0 , 5 , 0 , 0 , 1 , 0 ], [ 0 , 0 , 1 , 3 , 0 , 0 ], [ 0 , 1 , 4 , 26 , 8 , 0 ], [ 0 , 0 , 0 , 7 , 15 , 0 ], [ 0 , 0 , 0 , 1 , 0 , 5 ]]); print ( 'Constructed confusion matrix' , ee . ConfusionMatrix ( array )); // The "order" parameter refers to row and column class labels. When // unspecified, the class labels are assumed to be a 0-based sequence // incrementing by 1 with a length equal to row/column size. print ( 'Default row/column labels (unspecified "order" parameter)' , ee . ConfusionMatrix ({ array : array , order : null }). order ()); // Set the "order" parameter when custom class label integers are required. The // list of integer value labels should correspond to the matrix axes left to // right / top to bottom. var order = [ 11 , 22 , 42 , 52 , 71 , 81 ]; print ( 'Specified row/column labels (specified "order" parameter)' , ee . ConfusionMatrix ({ array : array , order : order }). order ());
import ee import geemap.core as geemap
Colab (Python)
# A confusion matrix. Rows correspond to actual values, columns to # predicted values. array = ee . Array ([[ 32 , 0 , 0 , 0 , 1 , 0 ], [ 0 , 5 , 0 , 0 , 1 , 0 ], [ 0 , 0 , 1 , 3 , 0 , 0 ], [ 0 , 1 , 4 , 26 , 8 , 0 ], [ 0 , 0 , 0 , 7 , 15 , 0 ], [ 0 , 0 , 0 , 1 , 0 , 5 ]]) display ( 'Constructed confusion matrix:' , ee . ConfusionMatrix ( array )) # The "order" parameter refers to row and column class labels. When # unspecified, the class labels are assumed to be a 0-based sequence # incrementing by 1 with a length equal to row/column size. display ( 'Default row/column labels (unspecified "order" parameter):' , ee . ConfusionMatrix ( array , None ) . order ()) # Set the "order" parameter when custom class label integers are required. The # list of integer value labels should correspond to the matrix axes left to # right / top to bottom. order = [ 11 , 22 , 42 , 52 , 71 , 81 ] display ( 'Specified row/column labels (specified "order" parameter):' , ee . ConfusionMatrix ( array , order ) . order ())
