The parallel information processing apparatus includes a plurality of nodes each including a first processor and a second processor. The first processor is configured to execute a computation process using a coefficient for a target data, computing a coefficient variation based on a result of the computation process, transferring the computed coefficient variation to the second processor and requesting the second processor to execute a transfer/receipt process. The second processor is configured to transmit the coefficient variation transferred from the first processor to another node and receive the coefficient variation computed by another node and integrate the coefficient variation transferred from the first processor and the coefficient variation computed by another node. At least one of the first processor and the second processor updates the coefficient to be used for the computation process from next time onward based on the integrated coefficient variation.
Please help me write a proper abstract based on the patent claims. CLAIM: 1. A parallel information processing apparatus comprising: a plurality of nodes each including a first processor; and a second processor, the first processor of each node configured to execute: a computation process using a coefficient for a processing target data; computing a coefficient variation based on a result of the computation process; transferring the computed coefficient variation to the second processor; and requesting the second processor to execute a transfer/receipt process of transferring the coefficient variation to another node of the parallel information processing apparatus and receiving a coefficient variation computed by another node, and the second processor of each node configured to execute: a communication process of transmitting the coefficient variation transferred from the first processor to another node and receiving the coefficient variation computed by another node; and an aggregation process of integrating the coefficient variation transferred from the first processor and the coefficient variation computed by another node, at least one of the first processor and the second processor updating the coefficient to be used for the computation process from next time onward, based on the integrated coefficient variation. 2. The parallel information processing apparatus according to claim 1, wherein the computation process includes layer-by-layer processes, to be executed in a predetermined sequence, of a plurality of hierarchies, and each layer-by-layer process of each hierarchy is a process of performing a computation using the coefficient about data input from a hierarchy previous to each hierarchy and outputting a computation result to a next hierarchy, the first processor computes the coefficient variation at each hierarchy, based on a result of the layer-by-layer process at each hierarchy, and transfers the computed coefficient variation to the second processor, and the second processor executes two or more aggregation processes about the coefficient variation at each hierarchy in parallel. 3. The parallel information processing apparatus according to claim 2, wherein a plurality of coefficients are used at each of the plurality of hierarchies, and take a form of coefficient string, and the first processor segments the coefficient string of each of the plurality of hierarchies into a plurality of segment strings, transfers the coefficient variation per segment string to the second processor, and requests the second processor to execute the transfer/receipt process per segment string. 4. The parallel information processing apparatus according to claim 2, wherein the first processor transfers the coefficient variations to the second processor by prioritizing the coefficient variation of the hierarchy being earlier in an execution sequence of the computation processes in the plurality of hierarchies, and requests the second processor to execute the transfer/receipt process. 5. The parallel information processing apparatus according to claim 2, wherein the second processor causes the first processor to update the coefficient to be used for the computation processes from next time onward by prioritizing the coefficient of the hierarchy being earlier in the execution sequence of the computation processes in the plurality of hierarchies. 6. The parallel information processing apparatus according to claim 2, wherein the first processor iteratively executes the layer-by-layer processes of the plurality of hierarchies in the predetermined sequence, and starts the layer-by-layer process of the hierarchy being earlier in the execution sequence of the next computation process without standing by for a reflection of the integrated coefficient variation about the coefficient to be used at the hierarchy being later in the execution sequence when updating the coefficient to be used for the computation processes from next time onward based on the integrated coefficient variation about the coefficient to be used at the hierarchy being earlier in the execution sequence in the plurality of hierarchies. 7. The parallel information processing apparatus according to claim 2, wherein when iteratively executing the computation process and a process of updating the coefficient to be used for the computation processes from next time onward a plural number of times, the first processor starts a next computation process before updating the coefficient to be used for the next computation process based on a coefficient variation given by a current computation process, and the coefficient to be used for a further next computation process after the next computation process is updated based on the coefficient variation given by the current computation process. 8. The parallel information processing apparatus according to claim 1, further comprising two or more storage units to store the coefficient, the first processor executing the computation process by using a first coefficient stored in a first storage unit, and storing, in a second storage unit, a second coefficient being updated based on a coefficient variation given by the executed computation process by using the first coefficient. 9. An information processing method in a parallel information processing apparatus comprising a plurality of nodes each including a first processor and a second processor, the information processing method comprising: executing by the first processor of each node, a computation process using a coefficient for a processing target data, computing a coefficient variation based on a result of the computation process, transferring the computed coefficient variation to the second processor, and requesting the second processor to execute a transfer/receipt process of transferring the coefficient variation to another node of the parallel information processing apparatus and receiving a coefficient variation computed by another node from another node; executing by the second processor of each node, a communication process of transmitting the coefficient variation transferred from the first processor to another node and receiving the coefficient variation computed by another node, and an aggregation process of integrating the coefficient variation transferred from the first processor and the coefficient variation computed by another node; and updating the coefficient to be used for the computation processes from next time onward, based on the integrated coefficient variation. 10. A computer readable non-transitory recording medium storing a program to be run by a parallel information processing apparatus comprising a plurality of nodes each including a first processor and a second processor, the program comprising: instructions for causing the first processor of each node to execute a computation process using a coefficient for a processing target data, compute a coefficient variation based on a result of the computation process, transfer the computed coefficient variation to the second processor, and request the second processor to execute a transfer/receipt process of transferring the coefficient variation to another node of the parallel information processing apparatus and receiving a coefficient variation computed by another node from another node; instructions for causing the second processor of each node to execute a communication process of transmitting the coefficient variation transferred from the first processor to another node and receiving the coefficient variation computed by another node, and an aggregation process of integrating the coefficient variation transferred from the first processor and the coefficient variation computed by another node; and instructions for causing at least one of the first processor and the second processor to update the coefficient to be used for the computation processes from next time onward, based on the integrated coefficient variation.