Inconsistencies in dataset annotations

[janpf]

Hi!
I've just found an inconsistency in the Darmstadt dataset dev split. I haven't checked whether this also occurs in different datasets or in different splits.

Two back-to-back examples in the dev split look like this:

{
  "sent_id": "DeVry_University_95_05-16-2004-6",
  "text": "I can't overemphasize that enough .",
  "opinions": [
    {
      "Source": [
        [],
        []
      ],
      "Target": [
        [
          "that"
        ],
        [
          "22:26"
        ]
      ],
      "Polar_expression": [
        [
          "can't overemphasize enough"
        ],
        [
          "2:33"
        ]
      ],
      "Polarity": "Positive",
      "Intensity": "Strong"
    }
  ]
},
{
  "sent_id": "DeVry_University_95_05-16-2004-7",
  "text": "The school gives students a knowledge base that makes them extremely competitive in the corporate world .",
  "opinions": [
    {
      "Source": [
        [],
        []
      ],
      "Target": [
        [
          "students"
        ],
        [
          "17:25"
        ]
      ],
      "Polar_expression": [
        [
          "extremely",
          "competitive"
        ],
        [
          "59:68",
          "69:80"
        ]
      ],
      "Polarity": "Positive",
      "Intensity": "Strong"
    }
  ]
},

Usually the datapoints are handled like in the second sentence: polar expressions (as well as source and target fields for that matter) are whitespace separated, even if the words are directly back-to-back. In the first sentence the whole polar expression is listed as a whole though and the span("2:33") even includes the target word("that"|"22:26") while it is not present in the string("can't overemphasize enough").
I'm actually unsure whether this issue stems for the provided preprocessing function or the underlying dataset.

I also noticed that for this example sentence both splitting methods are applied for polar_expression:

{
  "sent_id": "Capella_University_50_12-09-2005-3",
  "text": "I have found the course work and research more challenging and of higher quality at Capella than at any of the other institutions I graduated from .",
  "opinions": [
    {
      "Source": [
        [],
        []
      ],
      "Target": [
        [
          "course work research"
        ],
        [
          "17:41"
        ]
      ],
      "Polar_expression": [
        [
          "higher quality"
        ],
        [
          "66:80"
        ]
      ],
      "Polarity": "Positive",
      "Intensity": "Average"
    },
    {
      "Source": [
        [],
        []
      ],
      "Target": [
        [
          "course work research"
        ],
        [
          "17:41"
        ]
      ],
      "Polar_expression": [
        [
          "more",
          "challenging"
        ],
        [
          "42:46",
          "47:58"
        ]
      ],
      "Polarity": "Positive",
      "Intensity": "Strong"
    }
  ]
},

sometimes the indices for the polarity_expression strings are also missing:

{
  "sent_id": "St_Leo_University_4_04-16-2004-5",
  "text": "The teachers are very helpful , and the staff is , as well .",
  "opinions": [
    {
      "Source": [
        [],
        []
      ],
      "Target": [
        [
          "teachers"
        ],
        [
          "4:12"
        ]
      ],
      "Polar_expression": [
        [
          "very",
          "helpful"
        ],
        []
      ],
      "Polarity": "Positive",
      "Intensity": "Strong"
    },
    {
      "Source": [
        [],
        []
      ],
      "Target": [
        [
          "staff"
        ],
        [
          "40:45"
        ]
      ],
      "Polar_expression": [
        [
          "very",
          "helpful"
        ],
        []
      ],
      "Polarity": "Positive",
      "Intensity": "Strong"
    }
  ]
},

[jerbarnes]

Hi Jan,

Yes, you're right. This first issue stems from the dataset itself, where negators ('no', 'not', etc) and intensifiers ('very', 'extremely') are not explicitly included in the polar expression, but instead attached as properties. In the conversion script, we decided to leave them separate, but it is true that this choice is arbitrary. Regarding the missing indices, I'll have to have a deeper look into the code to see why that is happening. Thanks for bringing it up!

[janpf]

Thanks for your quick reply!

negators ('no', 'not', etc) and intensifiers ('very', 'extremely') are not explicitly included in the polar expression

that information actually helps a lot!
btw: in the train.json some even funkier stuff seems to be going on:

{
  "sent_id": "Colorado_Technical_University_Online_69_10-14-2005-1",
  "text": "They have used one of the books that was used by a professor of mine from a SUNY school that would only teach with graduate level books for undergraduate courses .",
  "opinions": [
    {
      "Source": [
        [],
        []
      ],
      "Target": [
        [
          "They"
        ],
        [
          "0:4"
        ]
      ],
      "Polar_expression": [
        [
          "no",
          "complaints"
        ],
        []
      ],
      "Polarity": "Positive",
      "Intensity": "Average"
    }
  ]
},

[jerbarnes]

Thanks for pointing that out. I'll have a look and try to get back to you soon.

[jerbarnes]

Ok, I've confirmed that this is only a problem in the Darmstadt dataset, only affects polar expressions, but occurs in all splits. The problem comes from the fact that the original annotations often span several sentences. That means that if you have a document with a target in the first sentence and a polar expression much later. When we divide the annotations into sentences, the polar expression is no longer in the sentence, which gives null offsets. I will refactor the code a bit to remove these sentences and push later today.

[jerbarnes]

Ok, I've updated the preprocessing script to remove the annotations that were problematic. Let me know if it works on your end and I'll close the issue.

[janpf]

Thanks! Looks like that removed the issues. If I find something else I'll just reopen ;)

[janpf]

I believe that there are some other cases of wrong annotations. Example from multibooked_ca/dev:

{
        "sent_id": "corpora/ca/quintessence-Miriam-1",
        "text": "La porteria i l ' escala .",
        "opinions": []
},
{
        "sent_id": "corpora/ca/quintessence-Miriam-2",
        "text": "Son poc accesibles quan vas amb nens petits i no posaba res a l ' anunci",
        "opinions": [
            {
                "Source": [
                    [],
                    []
                ],
                "Target": [
                    [
                        "l ' escala"
                    ],
                    [
                        "14:24"
                    ]
                ],
                "Polar_expression": [
                    [
                        "poc accesibles"
                    ],
                    [
                        "4:18"
                    ]
                ],
                "Polarity": "Negative",
                "Intensity": "Standard"
            },

the target doesn't exist in the source text, but in the sentence right before :O
the opener_en/dev also does contain an interesting case:

    {
        "sent_id": "../opener/en/kaf/hotel/english00200_e8f707795fc0c7f605a1f7115c3da711-2",
        "text": "Hotel Premiere Classe Orly Rungis is near the airport and close to Orly",
        "opinions": [
            {
                "Source": [
                    [],
                    []
                ],
                "Target": [
                    [
                        "Hotel Premiere Classe Orly Rungis"
                    ],
                    [
                        "0:33"
                    ]
                ],
                "Polar_expression": [
                    [
                        "near the airport"
                    ],
                    [
                        "37:53"
                    ]
                ],
                "Polarity": "Negative",
                "Intensity": "Standard"
            },
            {
                "Source": [
                    [],
                    []
                ],
                "Target": [
                    [
                        "Hotel Premiere Classe Orly Rungis"
                    ],
                    [
                        "0:33"
                    ]
                ],
                "Polar_expression": [
                    [
                        "close to Orly major highways"
                    ],
                    [
                        "0:71"
                    ]
                ],
                "Polarity": "Negative",
                "Intensity": "Standard"
            }
        ]
    },
    {
        "sent_id": "../opener/en/kaf/hotel/english00200_e8f707795fc0c7f605a1f7115c3da711-3",
        "text": "major highways ( all night heard the noise of passing large vehicles ) .",
        "opinions": [
            {
                "Source": [
                    [],
                    []
                ],
                "Target": [
                    [
                        "Hotel Premiere Classe Orly Rungis"
                    ],
                    [
                        "0:33"
                    ]
                ],
                "Polar_expression": [
                    [
                        "noise of passing large vehicles"
                    ],
                    [
                        "37:68"
                    ]
                ],
                "Polarity": "Negative",
                "Intensity": "Standard"
            }
        ]
    },

my guess is that some sentences have been by accident incorrectly split into two separate sentences?

[jerbarnes]

Yes, you are correct. I will have to have a deeper look at the other datasets and will come with corrections soon.

[jerbarnes]

It seems like the problem stems from the original sentence segmentation. The annotation was performed at document-level and although we told annotators to make sure that all sources/targets/expressions were annotated within sentences, at the time it wasn't completely clear that the annotations spanned across the incorrect sentence boundaries. This will require quite a bit of work to fix and I'm afraid I'll have to leave it for now. What I will do is filter the dev/eval data to make sure they do not influence the evaluation.

[egilron]

I compared the index and text representation for each segment of each elemet = ["Source", "Target", "Polar_expression"] in each opinion in the train data. I checked if the length of the text was similar to the length of the span represented by the index values. Here is what I got:

	Polar_expression dissimilar	Polar_expression similar	Source dissimilar	Source similar	Source empty	Target dissimilar	Target similar	Target empty
opener_en	95	2789	0	266	2618	17	2665	202
multibooked_eu	94	1590	5	200	1479	23	1262	399
opener_es	47	2997	0	176	2868	3	2756	285
multibooked_ca	62	1918	1	167	1812	23	1672	285
norec	0	9255	0	898	7550	0	6819	1670
darmstadt_unis	22	1077	0	63	743	2	804	0
mpqa	0	1706	0	1434	272	0	1481	225

Example sentence

{"sent_id": "../opener/en/kaf/hotel/english00192_e3fe22eeb360723a699504a27e13065e-5", 
   "text": "I can't explain in words how grand this place looks .", 
   "opinions": [{"Source": [[], []], "Target": [["this place"], ["36:46"]], "Polar_expression": [["how grand looks"], ["26:52"]], 
   "Polarity": "Positive", "Intensity": "Standard"}]}

For cases like this, where words are ommitted from the text, like "how grand looks", we could write a script to brake the element up in segments. Or just go with the index representations. Or just throw them out.

  for text, span in zip(opinion[element][0], opinion[element][1]):
      sp = [int(n) for n in span.split(":")]
      if len(text) == sp[1]- sp[0]:
          data.append(element + " similar")
      else: 
          data.append(element + " dissimilar")

[janpf]

@egilron nice work!
maybe you could add another column which indicates whether the string in source, target and expression exists in the original text in the first place? sometimes the indices are correct but the string doesn't appear anywhere at all.