Integrating and extracting topics from content of heterogeneous sources

1. A system for integrating and extracting topics from content of heterogeneous sources, the system comprising:

a processor to:

identify a plurality of observed words in documents that are received from the heterogeneous sources;

obtain document metadata and source metadata from the heterogeneous sources;

use the document metadata to calculate a plurality of word topic probabilities for the plurality of observed words;

use the source metadata to calculate a plurality of source topic probabilities for the plurality of observed words; and

determine a latent topic for one of the documents based on the plurality of observed words, the plurality of word topic probabilities, and the plurality of source topic probabilities, wherein the latent topic is determined using a Discriminative Dirichlet Allocation (DDA) modeling technique comprising:

in response to determining that a number of occurrences of related observed words assigned to the latent topic has reached a dynamic threshold, adjusting a word topic probability based on pre-determined user-defined features; and

adjusting the word topic probability of an observed word based on a source topic probability of the source topic probabilities associated with the observed word, wherein the adjusting the word topic probability of the observed word comprises using Gibbs sampling to apply a bicriterion that maximizes the plurality of word topic probabilities and uses the dynamic threshold to monitor the number of occurrences of the related observed words.

2. The system of claim 1 , wherein the processor is further to use a global vocabulary and a global Dirichlet prior parameter to determine a plurality of global word topic probabilities, wherein the latent topic is further based on the plurality of global word topic probabilities.

3. The system of claim 1 , wherein the heterogeneous sources comprise a news source, a blog source, a social media source, a document repository source, an online retailer source, an email source, and a discussion forum source.

4. A method, implemented at least in part by a computing device, for integrating and extracting topics from content of heterogeneous sources, the method comprising:

identifying, by using the computing device, a plurality of observed words in documents that are received from the heterogeneous sources;

preserving document metadata and source metadata from the heterogeneous sources;

using the document metadata to calculate a plurality of word topic probabilities for the plurality of observed words;

using the source metadata to calculate a plurality of source topic probabilities for the plurality of observed words; and

using a Discriminative Dirichlet Allocation (DDA) modeling technique to determine a latent topic for one of documents based on the plurality of observed words, the plurality of word topic probabilities, and the plurality of source topic probabilities, wherein the DDA modeling technique comprises:

in response to determining that a number of occurrences of related observed words assigned to the latent topic has reached a dynamic threshold, adjusting a word topic probability based on pre-determined user-defined features; and

adjusting the word topic probability of an observed word based on a source topic probability of the source topic probabilities associated with the observed word, wherein the adjusting the word topic probability of the observed word comprises using Gibbs sampling to apply a bicriterion that maximizes the plurality of word topic probabilities and uses the dynamic threshold to monitor the number of occurrences of the related observed words.

5. The method of claim 4 , further comprising using a global vocabulary and a global Dirichlet prior parameter to determine a plurality of global word topic probabilities, wherein the latent topic is further based on the plurality of global word topic probabilities.

6. The method of claim 4 , wherein the heterogeneous sources comprise a news source, a blog source, a social media source, a document repository source, an online retailer source, an email source, and a discussion forum source.

7. A non-transitory machine-readable storage medium encoded with instructions executable by a processor for integrating and extracting topics from content of heterogeneous sources, the machine-readable storage medium comprising instructions to:

identify a plurality of observed words in documents that are received from the heterogeneous sources;

obtain document metadata and source metadata from the heterogeneous sources;

use the document metadata to calculate a plurality of word topic probabilities for the plurality of observed words;

use a global vocabulary and a global Dirichlet prior parameter to determine a plurality of global word topic probabilities;

use the source metadata to calculate a plurality of source topic probabilities for the plurality of observed words; and

determine a latent topic for one of the documents based on the plurality of observed words, the plurality of word topic probabilities, the plurality of global word topic probabilities, and the plurality of source topic probabilities, wherein the latent topic is determined using a Discriminative Dirichlet Allocation (DDA) modeling technique that comprises:

in response to determining that a number of occurrences of related observed words assigned to the latent topic has reached a dynamic threshold, adjusting word topic probability based on pre-determined user-defined features; and

adjusting the word topic probability of an observed word based on a source topic probability of the source topic probabilities associated with the observed word, wherein the adjusting the word topic probability of the observed word comprises using Gibbs sampling to apply a bicriterion that maximizes the plurality of word topic probabilities and uses the dynamic threshold to monitor the number of occurrences of the related observed words.

8. The non-transitory machine-readable storage medium of claim 7 , wherein the heterogeneous sources comprise a news source, a blog source, a social media source, a document repository source, an online retailer source, an email source, and a discussion forum source.