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Fixes Issue #803 #804

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Fixes Issue #803 #804

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58b8346
support user defined tokens by bounding timestamp token if statement
aravindMahadevan Jun 11, 2024
7d0cdbf
Update src/tokenizers.js
aravindMahadevan Jun 11, 2024
e6e7e93
calculate timestamp_end instead of hardcoding
aravindMahadevan Jun 14, 2024
03b2c40
Update tokenizers.js
aravindMahadevan Jun 14, 2024
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7 changes: 6 additions & 1 deletion src/tokenizers.js
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Original file line number Diff line number Diff line change
Expand Up @@ -3610,6 +3610,11 @@ export class WhisperTokenizer extends PreTrainedTokenizer {
let chunk = new_chunk();
let time_offset = 0.0;
const timestamp_begin = this.model.convert_tokens_to_ids(["<|notimestamps|>"])[0] + 1;
// Whisper timestamp tokens start from 0.00 and go to timestamp 30.00 in 0.02 increments.
// We can calculate the last time stamp token as timestamp_begin plus the number of tokens
// tokens from 0.00 to 30.00 which is 1500.
const total_timestamp_tokens = (30.00 - 0.00) / 0.02;
const timestamp_end = timestamp_begin + total_timestamp_tokens;

let previous_tokens = [];
let previous_token_timestamps = [];
Expand Down Expand Up @@ -3697,7 +3702,7 @@ export class WhisperTokenizer extends PreTrainedTokenizer {
} else {
// 2/ This is a regular special token, ignoring it
}
} else if (token >= timestamp_begin) {
} else if (token >= timestamp_begin && token <= timestamp_end) {
// 3/ Timestamp token
const time = (token - timestamp_begin) * time_precision + time_offset;
const rounded_time = round(time, 2);
Expand Down