A method is provided that is performed in a network having nodes that generate heterogeneous logs including performance logs and text logs. The method includes performing, during a heterogeneous log training stage, (i) a log-to-time sequence conversion process for transforming clustered ones of training logs, from among the heterogeneous logs, into a set of time sequences that are each formed as a plurality of data pairs of a first configuration and a second configuration based on cluster type, (ii) a time series generation process for synchronizing particular ones of the time sequences in the set based on a set of criteria to output a set of fused time series, and (iii) an invariant model generation process for building invariant models for each time series data pair in the set of fused time series. The method includes controlling an anomaly-initiating one of the plurality of nodes based on the invariant models.
Please help me write a proper abstract based on the patent claims. CLAIM: 1. A method performed in a network having a plurality of nodes that generate heterogeneous logs including performance logs and text logs, the method comprising: performing, by a processor during a heterogeneous log training stage, (i) a log-to-time sequence conversion process for transforming clustered ones of training logs, from among the heterogeneous logs, into a set of time sequences that are each formed as a plurality of data pairs of a first configuration and a second configuration based on cluster type, (ii) a time series generation process for synchronizing particular ones of the time sequences in the set based on a set of criteria to output a set of fused time series, and (iii) an invariant model generation process for building invariant models for each time series data pair in the set of fused time series; and controlling, by the processor, an anomaly-initiating one of the plurality of nodes based on an output of the invariant models. 2. The method of claim 1, wherein the log-to-time sequence conversion process comprises a log schema recognition process and a per-cluster time sequence generation process. 3. The method of claim 2, wherein the log schema recognition process comprises: performing a tokenization process on the heterogeneous logs to generate tokens; performing a log similarity process on the heterogeneous logs based on the tokens to identify log similarities amongst the heterogeneous logs; and clustering the heterogeneous logs based on the log similarities. 4. The method of claim 2, wherein the per-cluster time sequence generation process comprises, for the performance logs, forming in the first configuration each of the plurality of data pairs to consist of a time stamp field value and a number field value. 5. The method of claim 2, wherein the per-cluster time sequence generation processes comprises, for the text logs, forming in the second configuration each of the plurality of data pairs to consist of a time stamp field value and a value indicating that a text log type occurs once at a time represented by the time stamp field value. 6. The method of claim 1, wherein the time series generation process comprises: performing a time window generation process that partitions a time domain into a plurality of disjoint time windows of equal size and duration; and resampling the time sequences in the set in accordance with the plurality of disjoint time windows. 7. The method of claim 6, wherein said resampling step comprises: transforming the time sequences in the set output from a performance log cluster into transformed time sequences each having a plurality of transformed of data pairs that include a window end time point and a linear interpolated sequence-based value; and transforming the time sequences in the set output from a text log cluster of a log schema into transformed time sequences each having a plurality of transformed of data pairs that include a window end time point and a number of log messages matching the log schema within a corresponding one of the plurality of time windows. 8. The method of claim 1, wherein the set of criteria, used by the time series generation process to determine the particular ones of the time series in the set to synchronize, comprises a common sampling time and a common frequency. 9. The method of claim 1, wherein the invariant model generation process comprises merging the fused time series in the set to form a multi-dimensional time series, and wherein the invariant models are built from the multi-dimensional time series. 10. The method of claim 1, further comprising repeating, by the processor during a heterogeneous log testing stage involving testing logs in place of the training logs, (i) the log-to-time sequence conversion process and (ii) the time series generation process, in order to test the invariant models. 11. The method of claim 1, further comprising performing, by a processor during a heterogeneous log testing stage, an invariant model testing process for testing the invariant models based on correlation mismatches in correlation patterns learned from the heterogeneous log training stage. 12. A computer program product for invariant model formation for a network having a plurality of nodes that generate heterogeneous logs including performance logs and text logs, the computer program product comprising a non-transitory computer readable storage medium having program instructions embodied therewith, the program instructions executable by a computer to cause the computer to perform a method comprising: performing, by a processor during a heterogeneous log training stage, (i) a log-to-time sequence conversion process for transforming clustered ones of training logs, from among the heterogeneous logs, into a set of time sequences that are each formed as a plurality of data pairs of a first configuration and a second configuration based on cluster type, (ii) a time series generation process for synchronizing particular ones of the time sequences in the set based on a set of criteria to output a set of fused time series, and (iii) an invariant model generation process for building invariant models for each time series data pair in the set of fused time series; and controlling, by the processor, an anomaly-initiating one of the plurality of nodes based on an output of the invariant models. 13. The computer program product of claim 12, wherein the log-to-time sequence conversion process comprises a log schema recognition process and a per-cluster time sequence generation process. 14. The computer program product of claim 13, wherein the log schema recognition process comprises: performing a tokenization process on the heterogeneous logs to generate tokens; performing a log similarity process on the heterogeneous logs based on the tokens to identify log similarities amongst the heterogeneous logs; and clustering the heterogeneous logs based on the log similarities. 15. The computer program product of claim 13, wherein the per-cluster time sequence generation process comprises, for the performance logs, forming in the first configuration each of the plurality of data pairs to consist of a time stamp field value and a number field value. 16. The computer program product of claim 13, wherein the per-cluster time sequence generation processes comprises, for the text logs, forming in the second configuration each of the plurality of data pairs to consist of a time stamp field value and a value indicating that a text log type occurs once at a time represented by the time stamp field value. 17. The computer program product of claim 12, wherein the time series generation process comprises: performing a time window generation process that partitions a time domain into a plurality of disjoint time windows of equal size and duration; and resampling the time sequences in the set in accordance with the plurality of disjoint time windows. 18. The computer program product of claim 17, wherein said resampling step comprises: transforming the time sequences in the set output from a performance log cluster into transformed time sequences each having a plurality of transformed of data pairs that include a window end time point and a linear interpolated sequence-based value; and transforming the time sequences in the set output from a text log cluster of a log schema into transformed time sequences each having a plurality of transformed of data pairs that include a window end time point and a number of log messages matching the log schema within a corresponding one of the plurality of time windows. 19. The computer program product of claim 12, wherein the set of criteria, used by the time series generation process to determine the particular ones of the time series in the set to synchronize, comprises a common sampling time and a common frequency. 20. A computer processing system for invariant model formation for a network having a plurality of nodes that generate heterogeneous logs including performance logs and text logs, the computer processing comprising: a processor configured to: perform, during a heterogeneous log training stage, (i) a log-to-time sequence conversion process for transforming clustered ones of training logs, from among the heterogeneous logs, into a set of time sequences that are each formed as a plurality of data pairs of a first configuration and a second configuration based on cluster type, (ii) a time series generation process for synchronizing particular ones of the time sequences in the set based on a set of criteria to output a set of fused time series, and (iii) an invariant model generation process for building invariant models for each time series data pair in the set of fused time series; and control an anomaly-initiating one of the plurality of nodes based on an output of the invariant models.