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package lesci
import (
"context"
"database/sql"
"fmt"
)
var (
sqlPairs = `
CREATE TEMP TABLE pairs AS
SELECT uid, pos, token, logprob,
LEAD(token, 1) OVER w AS next_tok,
LAG(token, 1) OVER w AS prev_tok
FROM context
WINDOW w AS (PARTITION BY uid ORDER BY pos)`
sqlMatched = `
CREATE TEMP TABLE matched AS
SELECT p.*, r1.c AS merged_as_first, r2.c AS merged_as_second
FROM pairs p
LEFT JOIN oov_rules r1 ON p.token = r1.a AND p.next_tok = r1.b
LEFT JOIN oov_rules r2 ON p.prev_tok = r2.a AND p.token = r2.b`
sqlSummedOOV = `
CREATE TEMP TABLE summed_oov AS
WITH processed AS (
SELECT
uid,
logprob,
COALESCE(merged_as_first, merged_as_second, token) AS tok,
CASE
WHEN merged_as_first IS NOT NULL THEN pos
WHEN merged_as_second IS NOT NULL THEN pos - 1
ELSE pos
END AS adjusted_pos
FROM matched
)
SELECT
uid,
tok,
adjusted_pos AS pos,
SUM(logprob) AS token_logprob
FROM processed
WHERE tok >= ? AND tok < ?
GROUP BY uid, tok, adjusted_pos`
sqlResults = `
CREATE TABLE lesci_results AS
SELECT tok,
QUANTILE_CONT(token_logprob, 0.5) AS median,
QUANTILE_CONT(token_logprob, 0.75) AS q75,
QUANTILE_CONT(token_logprob, 0.25) AS q25,
QUANTILE_CONT(token_logprob, 0.75)
- QUANTILE_CONT(token_logprob, 0.25) AS iqr,
AVG(token_logprob) AS mean,
STDDEV_SAMP(token_logprob) AS std,
COUNT(*) AS num,
tok < ? AS treat
FROM summed_oov
GROUP BY tok`
)
func (e *Experiment) Analyze(db *sql.DB) error {
ctx := context.Background()
var tx *sql.Tx
if t, err := db.BeginTx(ctx, nil); err != nil {
return err
} else {
tx = t
}
defer tx.Rollback()
if _, err := tx.ExecContext(ctx, `DROP TABLE IF EXISTS lesci_results`); err != nil {
return err
}
if _, err := tx.ExecContext(ctx, sqlPairs); err != nil {
return fmt.Errorf("pairs: %w", err)
}
if _, err := tx.ExecContext(ctx, sqlMatched); err != nil {
return fmt.Errorf("matched: %w", err)
}
low := e.cutoff - e.window
high := e.cutoff + e.window
if e.window == -1 {
low = 0
high = 10000000 // TODO use counterfactual
}
if _, err := tx.ExecContext(ctx, sqlSummedOOV, low, high); err != nil {
return fmt.Errorf("summed_oov: %w", err)
}
if _, err := tx.ExecContext(ctx, sqlResults, e.cutoff); err != nil {
return fmt.Errorf("lesci_results: %w", err)
}
if err := numSamples(ctx, tx); err != nil {
return err
}
return tx.Commit()
}
func numSamples(ctx context.Context, tx *sql.Tx) error {
var rows *sql.Rows
if r, err := tx.QueryContext(ctx, `SELECT treat, COUNT(*), SUM(num) FROM lesci_results GROUP BY treat ORDER BY treat DESC`); err != nil {
return err
} else {
rows = r
}
defer rows.Close()
for rows.Next() {
var treat bool
var tokens, occurrences int
if err := rows.Scan(&treat, &tokens, &occurrences); err != nil {
return err
}
side := "right"
if treat {
side = "left"
}
fmt.Printf("%s: %d tokens, %d occurrences\n", side, tokens, occurrences)
}
return rows.Err()
}
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