calculate symbol delay for (start, end) timestamps

egs/librispeech/ASR/conformer_ctc3/decode.py

@@ -633,7 +633,11 @@ def save_results(
         )
         with open(errs_filename, "w") as f:
             wer, mean_delay, var_delay = write_error_stats_with_timestamps(
-                f, f"{test_set_name}-{key}", results, enable_log=True
+                f,
+                f"{test_set_name}-{key}",
+                results,
+                enable_log=True,
+                with_end_time=True,
             )
             test_set_wers[key] = wer
             test_set_delays[key] = (mean_delay, var_delay)
@@ -649,16 +653,17 @@ def save_results(
         for key, val in test_set_wers:
             print("{}\t{}".format(key, val), file=f)
 
-    test_set_delays = sorted(test_set_delays.items(), key=lambda x: x[1][0])
+    # sort according to the mean start symbol delay
+    test_set_delays = sorted(test_set_delays.items(), key=lambda x: x[1][0][0])
     delays_info = (
         params.res_dir
         / f"symbol-delay-summary-{test_set_name}-{key}-{params.suffix}.txt"
     )
     with open(delays_info, "w") as f:
-        print("settings\tsymbol-delay", file=f)
+        print("settings\t(start, end) symbol-delay (s) (start, end)", file=f)
         for key, val in test_set_delays:
             print(
-                "{}\tmean: {}s, variance: {}".format(key, val[0], val[1]),
+                "{}\tmean: {}, variance: {}".format(key, val[0], val[1]),
                 file=f,
             )
 
@@ -669,10 +674,12 @@ def save_results(
         note = ""
     logging.info(s)
 
-    s = "\nFor {}, symbol-delay of different settings are:\n".format(test_set_name)
+    s = "\nFor {}, (start, end) symbol-delay (s) of different settings are:\n".format(
+        test_set_name
+    )
     note = "\tbest for {}".format(test_set_name)
     for key, val in test_set_delays:
-        s += "{}\tmean: {}s, variance: {}{}\n".format(key, val[0], val[1], note)
+        s += "{}\tmean: {}, variance: {}{}\n".format(key, val[0], val[1], note)
         note = ""
     logging.info(s)
 

icefall/utils.py

@@ -646,9 +646,18 @@ def write_error_stats(
 def write_error_stats_with_timestamps(
     f: TextIO,
     test_set_name: str,
-    results: List[Tuple[str, List[str], List[str], List[float], List[float]]],
+    results: List[
+        Tuple[
+            str,
+            List[str],
+            List[str],
+            List[Union[float, Tuple[float, float]]],
+            List[Union[float, Tuple[float, float]]],
+        ]
+    ],
     enable_log: bool = True,
-) -> Tuple[float, float, float]:
+    with_end_time: bool = False,
+) -> Tuple[float, Union[float, Tuple[float, float]], Union[float, Tuple[float, float]]]:
     """Write statistics based on predicted results and reference transcripts
     as well as their timestamps.
 
@@ -681,6 +690,8 @@ def write_error_stats_with_timestamps(
       enable_log:
         If True, also print detailed WER to the console.
         Otherwise, it is written only to the given file.
+      with_end_time:
+        Whether use end timestamps.
 
     Returns:
       Return total word error rate and mean delay.
@@ -726,7 +737,15 @@ def write_error_stats_with_timestamps(
                 words[ref_word][0] += 1
                 num_corr += 1
                 if has_time:
-                    all_delay.append(time_hyp[p_hyp] - time_ref[p_ref])
+                    if with_end_time:
+                        all_delay.append(
+                            (
+                                time_hyp[p_hyp][0] - time_ref[p_ref][0],
+                                time_hyp[p_hyp][1] - time_ref[p_ref][1],
+                            )
+                        )
+                    else:
+                        all_delay.append(time_hyp[p_hyp] - time_ref[p_ref])
                     p_hyp += 1
                     p_ref += 1
         if has_time:
@@ -738,16 +757,39 @@ def write_error_stats_with_timestamps(
     ins_errs = sum(ins.values())
     del_errs = sum(dels.values())
     tot_errs = sub_errs + ins_errs + del_errs
-    tot_err_rate = "%.2f" % (100.0 * tot_errs / ref_len)
+    tot_err_rate = float("%.2f" % (100.0 * tot_errs / ref_len))
 
-    mean_delay = "inf"
+    if with_end_time:
-    var_delay = "inf"
+        mean_delay = (float("inf"), float("inf"))
+        var_delay = (float("inf"), float("inf"))
+    else:
+        mean_delay = float("inf")
+        var_delay = float("inf")
     num_delay = len(all_delay)
     if num_delay > 0:
-        mean_delay = sum(all_delay) / num_delay
+        if with_end_time:
-        var_delay = sum([(i - mean_delay) ** 2 for i in all_delay]) / num_delay
+            all_delay_start = [i[0] for i in all_delay]
-        mean_delay = "%.3f" % mean_delay
+            mean_delay_start = sum(all_delay_start) / num_delay
-        var_delay = "%.3f" % var_delay
+            var_delay_start = (
+                sum([(i - mean_delay_start) ** 2 for i in all_delay_start]) / num_delay
+            )
+
+            all_delay_end = [i[1] for i in all_delay]
+            mean_delay_end = sum(all_delay_end) / num_delay
+            var_delay_end = (
+                sum([(i - mean_delay_end) ** 2 for i in all_delay_end]) / num_delay
+            )
+
+            mean_delay = (
+                float("%.3f" % mean_delay_start),
+                float("%.3f" % mean_delay_end),
+            )
+            var_delay = (float("%.3f" % var_delay_start), float("%.3f" % var_delay_end))
+        else:
+            mean_delay = sum(all_delay) / num_delay
+            var_delay = sum([(i - mean_delay) ** 2 for i in all_delay]) / num_delay
+            mean_delay = float("%.3f" % mean_delay)
+            var_delay = float("%.3f" % var_delay)
 
     if enable_log:
         logging.info(
@@ -756,7 +798,8 @@ def write_error_stats_with_timestamps(
             f"{del_errs} del, {sub_errs} sub ]"
         )
         logging.info(
-            f"[{test_set_name}] %symbol-delay mean: {mean_delay}s, variance: {var_delay} "  # noqa
+            f"[{test_set_name}] %symbol-delay mean (s): "
+            f"{mean_delay}, variance: {var_delay} "  # noqa
             f"computed on {num_delay} correct words"
         )
 
@@ -839,7 +882,8 @@ def write_error_stats_with_timestamps(
         hyp_count = corr + hyp_sub + ins
 
         print(f"{word}   {corr} {tot_errs} {ref_count} {hyp_count}", file=f)
-    return float(tot_err_rate), float(mean_delay), float(var_delay)
+
+    return tot_err_rate, mean_delay, var_delay
 
 
 class MetricsTracker(collections.defaultdict):
@@ -1661,7 +1705,7 @@ def parse_fsa_timestamps_and_texts(
     frame_shift_ms: float = 10,
 ) -> Tuple[List[Tuple[float, float]], List[List[str]]]:
     """Parse timestamps (in seconds) and texts for given decoded fsa paths.
-    Currently it supports two case:
+    Currently it supports two cases:
     (1) ctc-decoding, the attribtutes `labels` and `aux_labels`
         are both BPE tokens. In this case, sp should be provided.
     (2) HLG-based 1best, the attribtute `labels` is the prediction unit,