System and methods for adapting neural network acoustic models

1. A method for adapting a trained neural network acoustic model, the method comprising:

using at least one computer hardware processor to perform:

generating speaker information values for a speaker;

generating speech content values from speech data corresponding to an utterance spoken by the speaker;

processing the speech content values and the speaker information values using the trained neural network acoustic model, the trained neural network acoustic model comprising a neural network and the processing comprising inputting the speaker information values to a partial layer of nodes of the neural network that is positioned in the neural network before a hidden layer of nodes of the neural network, the partial layer of nodes being configured to apply a transformation to the speaker information values based on parameters with which the partial layer of nodes are configured; and

generating updated parameters for the partial layer of nodes based on the processing.

2. The method of claim 1 , further comprising using the at least one computer hardware processor to perform:

generating second speech content values from second speech data corresponding to a second utterance spoken by the speaker; and

processing the second speech content values and the speaker information values using the trained neural network acoustic model and the updated parameters for the partial layer of nodes.

3. The method of claim 1 , wherein generating the speaker information values comprises generating an i-vector for the speaker.

4. The method of claim 3 , wherein generating the i-vector for the speaker comprises generating a normalized and quantized i-vector for the speaker.

5. The method of claim 1 , wherein the neural network comprises at least three layers.

6. At least one non-transitory computer-readable storage medium storing processor-executable instructions that, when executed by at least one computer hardware processor, cause the at least one computer hardware processor to perform a method for adapting a trained neural network acoustic model, the method comprising:

generating speaker information values for a speaker based, at least in part, on statistics from speech data;

generating speech content values from speech data corresponding to an utterance spoken by the speaker;

processing the speech content values and the speaker information values using the trained neural network acoustic model, the trained neural network acoustic model comprising a neural network and the processing comprising inputting the speaker information values to a partial layer of nodes of the neural network that is positioned in the neural network before a hidden layer of nodes of the neural network, the partial layer of nodes being configured to apply a transformation to the speaker information values based on parameters with which the partial layer of nodes are configured; and

generating updated parameters for the partial layer of nodes based on the processing.

7. The at least one non-transitory computer-readable storage medium of claim 6 , where the method further comprises:

generating second speech content values from second speech data corresponding to a second utterance spoken by the speaker; and

processing the second speech content values and the speaker information values using the trained neural network acoustic model and the updated parameters for the partial layer of nodes.

8. The method of claim 6 , wherein generating the speaker information values comprises generating an i-vector for the speaker.

9. The method of claim 8 , wherein generating the i-vector for the speaker comprises generating a normalized and quantized i-vector for the speaker.

10. A system for adapting a trained neural network acoustic model, comprising:

at least one computer hardware processor; and

at least one non-transitory computer-readable storage medium storing processor-executable instructions that, when executed by the at least one computer hardware processor, cause the at least one computer hardware processor to perform:

generating speaker information values for a speaker based, at least in part, on statistics from speech data;

generating speech content values from speech data corresponding to an utterance spoken by the speaker;

processing the speech content values and the speaker information values using the trained neural network acoustic model, the trained neural network acoustic model comprising a neural network and the processing comprising inputting the speaker information values to a partial layer of nodes of the neural network that is positioned in the neural network before a hidden layer of nodes of the neural network, the partial layer of nodes being configured to apply a transformation to the speaker information values based on parameters with which the partial layer of nodes are configured; and

generating updated parameters for the partial layer of nodes based on the processing.

11. The system of claim 10 , further comprising using the at least one computer hardware processor to perform:

generating second speech content values from second speech data corresponding to a second utterance spoken by the speaker; and

processing the second speech content values and the speaker information values using the trained neural network acoustic model and the updated parameters for the partial layer of nodes.

12. The system of claim 10 , wherein generating the speaker information values comprises generating an i-vector for the speaker.

13. The system of claim 12 , wherein generating the i-vector for the speaker comprises generating a normalized and quantized i-vector for the speaker.

14. The system of claim 10 , wherein the neural network comprises at least three layers.