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from sklearn.base import BaseEstimator, ClassifierMixin, RegressorMixin

from dataclasses import dataclass
from typing import Generator, Callable, Any

import numpy as np


@dataclass
class SimpleEstimator(BaseEstimator):

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which echo > /dev/null 2>&1 && echo hoge

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find -L / -type l

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import java.io.StringReader
import scala.xml.parsing.NoBindingFactoryAdapter
import org.xml.sax.InputSource
import nu.validator.htmlparser.sax.HtmlParser
import nu.validator.htmlparser.common.XmlViolationPolicy

def parse(html: String) = {
  val parser = new HtmlParser
  parser.setNamePolicy(XmlViolationPolicy.ALLOW)

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du -h | sort -h

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val currentDir = new File(".").getAbsoluteFile().getParent()

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import com.typesafe.scalalogging.slf4j.Logging

class Test extends Logging {
  logger.warn("hello")
}

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java -Dswing.defaultlaf=com.sun.java.swing.plaf.windows.WindowsLookAndFeel

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val resource = getClass.getResource("/resource.txt").getFile

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def product[A](list: Seq[A], length: Int): Iterator[Seq[A]] = {
  @tailrec
  def _product(list: Stream[A], length: Int,
    accum: Stream[Seq[A]]): Stream[Seq[A]] = {

    length match {
      case 0 => accum
      case _ =>
        _product(list, length - 1,
          list map {