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Zahra Rajabi
pymdptoolbox
Commits
6630e624
Commit
6630e624
authored
Sep 10, 2013
by
Steven Cordwell
Browse files
use assert statements to ensure correct state
parent
fab13a85
Changes
2
Show whitespace changes
Inline
Sidebyside
src/mdptoolbox/mdp.py
View file @
6630e624
...
...
@@ 156,37 +156,22 @@ class MDP(object):
# if the discount is None then the algorithm is assumed to not use it
# in its computations
if
type
(
discount
)
in
(
int
,
float
):
if
(
discount
<=
0
)
or
(
discount
>
1
):
raise
ValueError
(
"Discount rate must be in ]0; 1]"
)
else
:
if
discount
==
1
:
print
(
"PyMDPtoolbox WARNING: check conditions of "
"convergence. With no discount, convergence is not "
"always assumed."
)
self
.
discount
=
discount
elif
discount
is
not
None
:
raise
ValueError
(
"PyMDPtoolbox: the discount must be a positive "
"real number less than or equal to one."
)
if
discount
is
not
None
:
self
.
discount
=
float
(
discount
)
assert
0.0
<
self
.
discount
<=
1.0
,
"Discount rate must be in ]0; 1]"
if
self
.
discount
==
1
:
print
(
"PyMDPtoolbox WARNING: check conditions of convergence. "
"With no discount, convergence is not always assumed."
)
# if the max_iter is None then the algorithm is assumed to not use it
# in its computations
if
type
(
max_iter
)
in
(
int
,
float
):
if
max_iter
<=
0
:
raise
ValueError
(
"The maximum number of iterations must be "
"greater than 0"
)
else
:
self
.
max_iter
=
max_iter
elif
max_iter
is
not
None
:
raise
ValueError
(
"PyMDPtoolbox: max_iter must be a positive real "
"number greater than zero."
)
if
max_iter
is
not
None
:
self
.
max_iter
=
int
(
max_iter
)
assert
self
.
max_iter
>
0
,
"The maximum number of iterations "
\
"must be greater than 0."
# check that epsilon is something sane
if
type
(
epsilon
)
in
(
int
,
float
):
if
epsilon
<=
0
:
raise
ValueError
(
"PyMDPtoolbox: epsilon must be greater than "
"0."
)
elif
epsilon
is
not
None
:
raise
ValueError
(
"PyMDPtoolbox: epsilon must be a positive real "
"number greater than zero."
)
if
epsilon
is
not
None
:
self
.
epsilon
=
float
(
epsilon
)
assert
self
.
epsilon
>
0
,
"Epsilon must be greater than 0."
# we run a check on P and R to make sure they are describing an MDP. If
# an exception isn't raised then they are assumed to be correct.
check
(
transitions
,
reward
)
...
...
@@ 218,10 +203,10 @@ class MDP(object):
else
:
# make sure the user supplied V is of the right shape
try
:
if
V
.
shape
not
in
((
self
.
S
,),
(
1
,
self
.
S
))
:
raise
ValueError
(
"bellman: V is not the right shape
."
)
assert
V
.
shape
in
((
self
.
S
,),
(
1
,
self
.
S
))
,
"V is not the "
\
"right shape (Bellman operator)
."
except
AttributeError
:
raise
TypeError
(
"
bellman:
V must be a numpy array or matrix."
)
raise
TypeError
(
"V must be a numpy array or matrix."
)
# Looping through each action the the Qvalue matrix is calculated.
# P and V can be any object that supports indexing, so it is important
# that you know they define a valid MDP before calling the
...
...
@@ 266,34 +251,20 @@ class MDP(object):
self
.
S
=
P
[
0
].
shape
[
0
]
except
AttributeError
:
self
.
S
=
P
[
0
].
shape
[
0
]
except
:
raise
# convert Ps to matrices
self
.
P
=
[]
for
aa
in
xrange
(
self
.
A
):
self
.
P
.
append
(
P
[
aa
])
self
.
P
=
tuple
(
self
.
P
)
# convert P to a tuple of numpy arrays
self
.
P
=
tuple
([
P
[
aa
]
for
aa
in
range
(
self
.
A
)])
# Set self.R as a tuple of length A, with each element storing an 1×S
# vector.
try
:
if
R
.
ndim
==
2
:
self
.
R
=
[]
for
aa
in
xrange
(
self
.
A
):
self
.
R
.
append
(
array
(
R
[:,
aa
]).
reshape
(
self
.
S
))
self
.
R
=
tuple
([
array
(
R
[:,
aa
]).
reshape
(
self
.
S
)
for
aa
in
range
(
self
.
A
)])
else
:
raise
AttributeError
except
AttributeError
:
self
.
R
=
[]
for
aa
in
xrange
(
self
.
A
):
try
:
self
.
R
.
append
(
P
[
aa
].
multiply
(
R
[
aa
]).
sum
(
1
).
reshape
(
self
.
S
))
self
.
R
=
tuple
([
multiply
(
P
[
aa
],
R
[
aa
]).
sum
(
1
).
reshape
(
self
.
S
)
for
aa
in
xrange
(
self
.
A
)])
except
AttributeError
:
self
.
R
.
append
(
multiply
(
P
[
aa
],
R
[
aa
]).
sum
(
1
).
reshape
(
self
.
S
))
except
:
raise
except
:
raise
self
.
R
=
tuple
(
self
.
R
)
self
.
R
=
tuple
([
multiply
(
P
[
aa
],
R
[
aa
]).
sum
(
1
).
reshape
(
self
.
S
)
for
aa
in
xrange
(
self
.
A
)])
def
_iterate
(
self
):
# Raise error because child classes should implement this function.
...
...
@@ 363,10 +334,8 @@ class FiniteHorizon(MDP):
def
__init__
(
self
,
transitions
,
reward
,
discount
,
N
,
h
=
None
):
# Initialise a finite horizon MDP.
if
N
<
1
:
raise
ValueError
(
'PyMDPtoolbox: N must be greater than 0'
)
else
:
self
.
N
=
N
self
.
N
=
int
(
N
)
assert
self
.
N
>
0
,
'PyMDPtoolbox: N must be greater than 0.'
# Initialise the base class
MDP
.
__init__
(
self
,
transitions
,
reward
,
discount
,
None
,
None
)
# remove the iteration counter, it is not meaningful for backwards
...
...
src/mdptoolbox/utils.py
View file @
6630e624
...
...
@@ 7,6 +7,8 @@ Created on Sun Aug 18 14:30:09 2013
from
numpy
import
absolute
,
ones
SMALLNUM
=
10e12
# These need to be fixed so that we use classes derived from Error.
mdperr
=
{
"mat_nonneg"
:
...
...
@@ 250,7 +252,7 @@ def checkSquareStochastic(Z):
# check that the matrix is square, and that each row sums to one
if
s1
!=
s2
:
raise
InvalidMDPError
(
mdperr
[
"mat_square"
])
elif
(
absolute
(
Z
.
sum
(
axis
=
1
)

ones
(
s2
))).
max
()
>
10e12
:
elif
(
absolute
(
Z
.
sum
(
axis
=
1
)

ones
(
s2
))).
max
()
>
SMALLNUM
:
raise
InvalidMDPError
(
mdperr
[
"mat_stoch"
])
# make sure that there are no values less than zero
try
:
...
...
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