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subsample.go
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subsample.go
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// Copyright © 2020 wego authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package subsample
import (
"math"
"math/rand"
"github.com/e-gun/wego/pkg/corpus/dictionary"
)
type Subsampler struct {
samples []float64
}
func New(
dic *dictionary.Dictionary,
threshold float64,
) *Subsampler {
samples := make([]float64, dic.Len())
for i := 0; i < dic.Len(); i++ {
z := 1. - math.Sqrt(threshold/float64(dic.IDFreq(i)))
if z < 0 {
z = 0
}
samples[i] = z
}
return &Subsampler{
samples: samples,
}
}
func (s *Subsampler) Trial(id int) bool {
bernoulliTrial := rand.Float64()
var ok bool
if s.samples[id] > bernoulliTrial {
ok = true
}
return ok
}