Google I / O가 5 월 18 ~ 20 일에 돌아옵니다! 공간을 예약하고 일정을 짜세요

tf.keras.metrics.TruePositives

Calculates the number of true positives.

Inherits From: `Metric`, `Layer`, `Module`

Used in the notebooks

Used in the tutorials

If `sample_weight` is given, calculates the sum of the weights of true positives. This metric creates one local variable, `true_positives` that is used to keep track of the number of true positives.

If `sample_weight` is `None`, weights default to 1. Use `sample_weight` of 0 to mask values.

`thresholds` (Optional) Defaults to 0.5. A float value or a python list/tuple of float threshold values in [0, 1]. A threshold is compared with prediction values to determine the truth value of predictions (i.e., above the threshold is `true`, below is `false`). One metric value is generated for each threshold value.
`name` (Optional) string name of the metric instance.
`dtype` (Optional) data type of the metric result.

Standalone usage:

````m = tf.keras.metrics.TruePositives()`
`m.update_state([0, 1, 1, 1], [1, 0, 1, 1])`
`m.result().numpy()`
`2.0`
```
````m.reset_state()`
`m.update_state([0, 1, 1, 1], [1, 0, 1, 1], sample_weight=[0, 0, 1, 0])`
`m.result().numpy()`
`1.0`
```

Usage with `compile()` API:

``````model.compile(optimizer='sgd',
loss='mse',
metrics=[tf.keras.metrics.TruePositives()])
``````

Methods

`reset_state`

View source

Resets all of the metric state variables.

This function is called between epochs/steps, when a metric is evaluated during training.

`result`

View source

Computes and returns the metric value tensor.

Result computation is an idempotent operation that simply calculates the metric value using the state variables.

`update_state`

View source

Accumulates the metric statistics.

Args
`y_true` The ground truth values.
`y_pred` The predicted values.
`sample_weight` Optional weighting of each example. Defaults to 1. Can be a `Tensor` whose rank is either 0, or the same rank as `y_true`, and must be broadcastable to `y_true`.

Returns
Update op.

[{ "type": "thumb-down", "id": "missingTheInformationINeed", "label":"필요한 정보가 없음" },{ "type": "thumb-down", "id": "tooComplicatedTooManySteps", "label":"너무 복잡함/단계 수가 너무 많음" },{ "type": "thumb-down", "id": "outOfDate", "label":"오래됨" },{ "type": "thumb-down", "id": "samplesCodeIssue", "label":"Samples / code issue" },{ "type": "thumb-down", "id": "otherDown", "label":"기타" }]
[{ "type": "thumb-up", "id": "easyToUnderstand", "label":"이해하기 쉬움" },{ "type": "thumb-up", "id": "solvedMyProblem", "label":"문제가 해결됨" },{ "type": "thumb-up", "id": "otherUp", "label":"기타" }]