1 . An information processing apparatus comprising: at least one memory storing instructions, and at least one processor configured to execute the instructions to; receive observation data from at least one sensor, the observation data being obtained by observing an obstacle in a plurality of areas; determine presence/absence of an obstacle in the plurality of areas by using the observation data; and specify, when the presence/absence of an obstacle in a first area included in the plurality of areas is unknown, a probability of presence of an obstacle in the first area by using a determination result indicating presence/absence of an obstacle in an area near the first area, wherein the probability of the presence of an obstacle in the first area changes depending on presence/absence of an obstacle in the area near the first area.
2 . The information processing apparatus according to claim 1 , wherein the at least one processor is further configured to execute the instructions to set a label indicating whether or not there is an obstacle in the plurality of areas by using the determination result for each of the plurality of areas and the probability of the presence of an obstacle in the first area.
3 . The information processing apparatus according to claim 2 , wherein the plurality of areas are a plurality of cells of a grid generated by dividing a travelling area of a mobile body, and the at least one processor is further configured to execute the instructions to calculate a probability of presence of an obstacle in a first cell of the grid where the observation data indicates that presence/absence of an obstacle is unknown.
4 . The information processing apparatus according to claim 3 , wherein the at least one processor is further configured to execute the instructions to calculate the probability of the presence of an obstacle in the first cell of the grid by using a value of a weight that is used when the label is set to the first cell and a second cell adjacent to the first cell, the value of the weight being changed according to a determination result for the second cell.
5 . The information processing apparatus according to claim 3 , wherein the at least one processor is further configured to execute the instructions to receive, after receiving observation data of the plurality of cells of the grid at a first time, observation data of the plurality of cells of the grid at a second time, and determine whether or not there is a moving obstacle based on a transition in the determination result of each of the cells of the grid between the first and second times.
6 . The information processing apparatus according to claim 5 , wherein the at least one processor is further configured to execute the instructions to determine, by using a value of a weight that is used when the label is set to a third cell of the grid at the first time, the third cell at the second time, or a cell adjacent to the third cell at the second time, whether or not there is a moving obstacle according to the determination result for the third cell of the grid at the first time and the determination result for the third cell or the cell adjacent to the third cell at the second time.
7 . The information processing apparatus according to claim 3 , wherein the at least one processor is further configured to execute the instructions to calculate a cost function indicating safety of travelling of the mobile body by using a speed pattern indicating a speed of the mobile body, a moving pattern indicating a moving route of the mobile body and indicated by using a probability model, and a probability of presence of an obstacle in each cell of the grid located on the moving route indicated by the moving pattern; and control the speed of the mobile body based on the calculated cost function.
8 . A communication system comprising: at least one memory storing instructions, and at least one processor configured to execute the instructions to; observe an obstacle in a plurality of areas and transmit observation data indicating a result of the observation; determine presence/absence of an obstacle in the plurality of areas by using the observation data; and specify, when the presence/absence of an obstacle in a first area included in the plurality of areas is unknown, a probability of presence of an obstacle in the first area by using a determination result indicating presence/absence of an obstacle in an area near the first area, wherein the probability of the presence of an obstacle in the first area changes depending on presence/absence of an obstacle in the area near the first area.
9 . The communication system according to claim 8 , wherein the at least one processor is further configured to execute the instructions to set a label indicating whether or not there is an obstacle in the plurality of areas by using the determination result for each of the plurality of areas and the probability of the presence of an obstacle in the first area.
10 . The communication system according to claim 9 , wherein the plurality of areas are a plurality of cells of a grid generated by dividing a travelling area of a mobile body, and the at least one processor is further configured to execute the instructions to calculate a probability of presence of an obstacle in a first cell of the grid where the observation data indicates that presence/absence of an obstacle is unknown.
11 . The communication system according to claim 10 , wherein the at least one processor is further configured to execute the instructions to calculate the probability of the presence of an obstacle in the first cell of the grid by using a value of a weight that is used when the label is set to the first cell and a second cell adjacent to the first cell, the value of the weight being changed according to a determination result for the second cell.
12 . The communication system according to claim 10 , wherein the at least one processor is further configured to execute the instructions to receive, after receiving observation data of the plurality of cells of the grid at a first time, observation data of the plurality of cells of the grid at a second time; and determine whether or not there is a moving obstacle based on a transition in the determination result of each of the cells of the grid between the first and second times.
13 . The communication system according to claim 12 , wherein the at least one processor is further configured to execute the instructions to set a label indicating that there is a stationary obstacle, there is a moving obstacle, or there is no obstacle in each cell of the grid, and determine, by using a value of a weight that is used when the label is set to a third cell of the grid at the first time, the third cell at the second time, or a cell adjacent to the third cell at the second time, whether or not there is a moving obstacle according to the determination result for the third cell of the grid at the first time and the determination result for the third cell or the cell adjacent to the third cell at the second time.
14 . The communication system according to claim 10 , wherein the at least one processor is further configured to execute the instructions to: calculate a cost function indicating safety of travelling of the mobile body by using a speed pattern indicating a speed of the mobile body, a moving pattern indicating a moving route of the mobile body and indicated by using a probability model, and a probability of presence of an obstacle in each cell of the grid located on the moving route indicated by the moving pattern; and control the speed of the mobile body based on the calculated cost function.
15 . A specifying method comprising: receiving observation data from at least one sensor, the observation data being obtained by observing an obstacle in a plurality of areas; determining presence/absence of an obstacle in the plurality of areas by using the observation data; and specifying, when the presence/absence of an obstacle in a first area included in the plurality of areas is unknown, a probability of presence of an obstacle in the first area by using a determination result indicating presence/absence of an obstacle in an area near the first area, wherein the probability of the presence of an obstacle in the first area changes depending on presence/absence of an obstacle in the area near the first area.
16 . The specifying method according to claim 15 , further comprising setting a label indicating whether or not there is an obstacle in the plurality of areas by using the determination result for each of the plurality of areas and the probability of the presence of an obstacle in the first area.
17 . The specifying method according to claim 16 , wherein the plurality of areas are a plurality of cells of a grid generated by dividing a travelling area of a mobile body, and when a probability of presence of an obstacle is specified, a probability of presence of an obstacle in a first cell of the grid where the observation data indicates that presence/absence of an obstacle is unknown is calculated.
18 . The specifying method according to claim 17 , wherein when a probability of presence of an obstacle is specified, a probability of presence of an obstacle in the first cell of the grid is calculated by using a value of a weight that is used when the label is set to the first cell and a second cell adjacent to the first cell, the value of the weight being changed according to a determination result for the second cell.
19 . The specifying method according to claim 17 , wherein when the observation data is received, after observation data of the plurality of cells of the grid at a first time is received, observation data of the plurality of cells of the grid at a second time is received, and whether or not there is a moving obstacle is determined based on a transition in the determination result of each of the cells of the grid between the first and second times.
20 . The specifying method according to claim 19 , wherein when the label is set, whether or not there is a moving obstacle is determined, by using a value of a weight that is used when the label is set to a third cell of the grid at the first time, the third cell at the second time, or a cell adjacent to the third cell at the second time, according to the determination result for the third cell of the grid at the first time and the determination result for the third cell or the cell adjacent to the third cell at the second time.
21 . (canceled)
