We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
Add support for loading URLs to CompilerEnvStateReader.read_paths()
## 🚀 Feature

Extend [CompilerEnvStateReader.read_paths()](https://github.com/facebookresearch/CompilerGym/blob/de07d4867e0bb0b47f6fa4bce5e262ea8f014c3e/tests/compiler_env_state_test.py#L212-L335) so that any combination of file path or URL can be loaded.

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `compiler_gym/compiler_env_state.py`
Content:
```
1 # Copyright (c) Facebook, Inc. and its affiliates.
2 #
3 # This source code is licensed under the MIT license found in the
4 # LICENSE file in the root directory of this source tree.
5 """This module defines a class to represent a compiler environment state."""
6 import csv
7 import sys
8 from typing import Iterable, List, Optional, TextIO
9 
10 from pydantic import BaseModel, Field, validator
11 
12 from compiler_gym.datasets.uri import BenchmarkUri
13 from compiler_gym.util.truncate import truncate
14 
15 
16 class CompilerEnvState(BaseModel):
17     """The representation of a compiler environment state.
18 
19     The state of an environment is defined as a benchmark and a sequence of
20     actions that has been applied to it. For a given environment, the state
21     contains the information required to reproduce the result.
22     """
23 
24     benchmark: str = Field(
25         allow_mutation=False,
26         examples=[
27             "benchmark://cbench-v1/crc32",
28             "generator://csmith-v0/0",
29         ],
30     )
31     """The URI of the benchmark used for this episode."""
32 
33     commandline: str
34     """The list of actions that produced this state, as a commandline."""
35 
36     walltime: float
37     """The walltime of the episode in seconds. Must be non-negative."""
38 
39     reward: Optional[float] = Field(
40         required=False,
41         default=None,
42         allow_mutation=True,
43     )
44     """The cumulative reward for this episode. Optional."""
45 
46     @validator("walltime")
47     def walltime_nonnegative(cls, v):
48         if v is not None:
49             assert v >= 0, "Walltime cannot be negative"
50         return v
51 
52     @validator("benchmark", pre=True)
53     def validate_benchmark(cls, value):
54         if isinstance(value, BenchmarkUri):
55             return str(value)
56         return value
57 
58     @property
59     def has_reward(self) -> bool:
60         """Return whether the state has a reward value."""
61         return self.reward is not None
62 
63     def __eq__(self, rhs) -> bool:
64         if not isinstance(rhs, CompilerEnvState):
65             return False
66         epsilon = 1e-5
67         # Only compare reward if both states have it.
68         if not (self.has_reward and rhs.has_reward):
69             reward_equal = True
70         else:
71             reward_equal = abs(self.reward - rhs.reward) < epsilon
72         # Note that walltime is excluded from equivalence checks as two states
73         # are equivalent if they define the same point in the optimization space
74         # irrespective of how long it took to get there.
75         return (
76             self.benchmark == rhs.benchmark
77             and reward_equal
78             and self.commandline == rhs.commandline
79         )
80 
81     def __ne__(self, rhs) -> bool:
82         return not self == rhs
83 
84     class Config:
85         validate_assignment = True
86 
87 
88 class CompilerEnvStateWriter:
89     """Serialize compiler environment states to CSV.
90 
91     Example use:
92 
93         >>> with CompilerEnvStateWriter(open("results.csv", "wb")) as writer:
94         ...     writer.write_state(env.state)
95     """
96 
97     def __init__(self, f: TextIO, header: bool = True):
98         """Constructor.
99 
100         :param f: The file to write to.
101         :param header: Whether to include a header row.
102         """
103         self.f = f
104         self.writer = csv.writer(self.f, lineterminator="\n")
105         self.header = header
106 
107     def write_state(self, state: CompilerEnvState, flush: bool = False) -> None:
108         """Write the state to file.
109 
110         :param state: A compiler environment state.
111 
112         :param flush: Write to file immediately.
113         """
114         if self.header:
115             self.writer.writerow(("benchmark", "reward", "walltime", "commandline"))
116             self.header = False
117         self.writer.writerow(
118             (state.benchmark, state.reward, state.walltime, state.commandline)
119         )
120         if flush:
121             self.f.flush()
122 
123     def __enter__(self):
124         """Support with-statement for the writer."""
125         return self
126 
127     def __exit__(self, *args):
128         """Support with-statement for the writer."""
129         self.f.close()
130 
131 
132 class CompilerEnvStateReader:
133     """Read states from a CSV file.
134 
135     Example usage:
136 
137         >>> with CompilerEnvStateReader(open("results.csv", "rb")) as reader:
138         ...     for state in reader:
139         ...         print(state)
140     """
141 
142     def __init__(self, f: TextIO):
143         """Constructor.
144 
145         :param f: The file to read.
146         """
147         self.f = f
148         self.reader = csv.reader(self.f)
149 
150     def __iter__(self) -> Iterable[CompilerEnvState]:
151         """Read the states from the file."""
152         columns_in_order = ["benchmark", "reward", "walltime", "commandline"]
153         # Read the CSV and coerce the columns into the expected order.
154         for (
155             benchmark,
156             reward,
157             walltime,
158             commandline,
159         ) in self._iterate_columns_in_order(self.reader, columns_in_order):
160             yield CompilerEnvState(
161                 benchmark=benchmark,
162                 reward=None if reward == "" else float(reward),
163                 walltime=0 if walltime == "" else float(walltime),
164                 commandline=commandline,
165             )
166 
167     @staticmethod
168     def _iterate_columns_in_order(
169         reader: csv.reader, columns: List[str]
170     ) -> Iterable[List[str]]:
171         """Read the input CSV and return each row in the given column order.
172 
173         Supports CSVs both with and without a header. If no header, columns are
174         expected to be in the correct order. Else the header row is used to
175         determine column order.
176 
177         Header row detection is case insensitive.
178 
179         :param reader: The CSV file to read.
180 
181         :param columns: A list of column names in the order that they are
182             expected.
183 
184         :return: An iterator over rows.
185         """
186         try:
187             row = next(reader)
188         except StopIteration:
189             # Empty file.
190             return
191 
192         if len(row) != len(columns):
193             raise ValueError(
194                 f"Expected {len(columns)} columns in the first row of CSV: {truncate(row)}"
195             )
196 
197         # Convert the maybe-header columns to lowercase for case-insensitive
198         # comparison.
199         maybe_header = [v.lower() for v in row]
200         if set(maybe_header) == set(columns):
201             # The first row matches the expected columns names, so use it to
202             # determine the column order.
203             column_order = [maybe_header.index(v) for v in columns]
204             yield from ([row[v] for v in column_order] for row in reader)
205         else:
206             # The first row isn't a header, so assume that all rows are in
207             # expected column order.
208             yield row
209             yield from reader
210 
211     def __enter__(self):
212         """Support with-statement for the reader."""
213         return self
214 
215     def __exit__(self, *args):
216         """Support with-statement for the reader."""
217         self.f.close()
218 
219     @staticmethod
220     def read_paths(paths: Iterable[str]) -> Iterable[CompilerEnvState]:
221         """Read a states from a list of file paths.
222 
223         Read states from stdin using a special path :code:`"-"`.
224 
225         :param: A list of paths.
226 
227         :return: A generator of compiler env states.
228         """
229         for path in paths:
230             if path == "-":
231                 yield from iter(CompilerEnvStateReader(sys.stdin))
232             else:
233                 with open(path) as f:
234                     yield from iter(CompilerEnvStateReader(f))
235
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/compiler_gym/compiler_env_state.py b/compiler_gym/compiler_env_state.py
--- a/compiler_gym/compiler_env_state.py
+++ b/compiler_gym/compiler_env_state.py
@@ -4,9 +4,12 @@
 # LICENSE file in the root directory of this source tree.
 """This module defines a class to represent a compiler environment state."""
 import csv
+import re
 import sys
+from io import StringIO
 from typing import Iterable, List, Optional, TextIO
 
+import requests
 from pydantic import BaseModel, Field, validator
 
 from compiler_gym.datasets.uri import BenchmarkUri
@@ -23,10 +26,7 @@
 
     benchmark: str = Field(
         allow_mutation=False,
-        examples=[
-            "benchmark://cbench-v1/crc32",
-            "generator://csmith-v0/0",
-        ],
+        examples=["benchmark://cbench-v1/crc32", "generator://csmith-v0/0",],
     )
     """The URI of the benchmark used for this episode."""
 
@@ -37,9 +37,7 @@
     """The walltime of the episode in seconds. Must be non-negative."""
 
     reward: Optional[float] = Field(
-        required=False,
-        default=None,
-        allow_mutation=True,
+        required=False, default=None, allow_mutation=True,
     )
     """The cumulative reward for this episode. Optional."""
 
@@ -229,6 +227,16 @@
         for path in paths:
             if path == "-":
                 yield from iter(CompilerEnvStateReader(sys.stdin))
+            elif (
+                re.match(r"^(http|https)://[a-zA-Z0-9.-_/]+(\.csv)$", path) is not None
+            ):
+                response: requests.Response = requests.get(path)
+                if response.status_code == 200:
+                    yield from iter(CompilerEnvStateReader(StringIO(response.text)))
+                else:
+                    raise requests.exceptions.InvalidURL(
+                        f"Url {path} content could not be obtained"
+                    )
             else:
                 with open(path) as f:
                     yield from iter(CompilerEnvStateReader(f))

{"golden_diff": "diff --git a/compiler_gym/compiler_env_state.py b/compiler_gym/compiler_env_state.py\n--- a/compiler_gym/compiler_env_state.py\n+++ b/compiler_gym/compiler_env_state.py\n@@ -4,9 +4,12 @@\n # LICENSE file in the root directory of this source tree.\n \"\"\"This module defines a class to represent a compiler environment state.\"\"\"\n import csv\n+import re\n import sys\n+from io import StringIO\n from typing import Iterable, List, Optional, TextIO\n \n+import requests\n from pydantic import BaseModel, Field, validator\n \n from compiler_gym.datasets.uri import BenchmarkUri\n@@ -23,10 +26,7 @@\n \n     benchmark: str = Field(\n         allow_mutation=False,\n-        examples=[\n-            \"benchmark://cbench-v1/crc32\",\n-            \"generator://csmith-v0/0\",\n-        ],\n+        examples=[\"benchmark://cbench-v1/crc32\", \"generator://csmith-v0/0\",],\n     )\n     \"\"\"The URI of the benchmark used for this episode.\"\"\"\n \n@@ -37,9 +37,7 @@\n     \"\"\"The walltime of the episode in seconds. Must be non-negative.\"\"\"\n \n     reward: Optional[float] = Field(\n-        required=False,\n-        default=None,\n-        allow_mutation=True,\n+        required=False, default=None, allow_mutation=True,\n     )\n     \"\"\"The cumulative reward for this episode. Optional.\"\"\"\n \n@@ -229,6 +227,16 @@\n         for path in paths:\n             if path == \"-\":\n                 yield from iter(CompilerEnvStateReader(sys.stdin))\n+            elif (\n+                re.match(r\"^(http|https)://[a-zA-Z0-9.-_/]+(\\.csv)$\", path) is not None\n+            ):\n+                response: requests.Response = requests.get(path)\n+                if response.status_code == 200:\n+                    yield from iter(CompilerEnvStateReader(StringIO(response.text)))\n+                else:\n+                    raise requests.exceptions.InvalidURL(\n+                        f\"Url {path} content could not be obtained\"\n+                    )\n             else:\n                 with open(path) as f:\n                     yield from iter(CompilerEnvStateReader(f))\n", "issue": "Add support for loading URLs to CompilerEnvStateReader.read_paths()\n## \ud83d\ude80 Feature\r\n\r\nExtend [CompilerEnvStateReader.read_paths()](https://github.com/facebookresearch/CompilerGym/blob/de07d4867e0bb0b47f6fa4bce5e262ea8f014c3e/tests/compiler_env_state_test.py#L212-L335) so that any combination of file path or URL can be loaded.\n", "before_files": [{"content": "# Copyright (c) Facebook, Inc. and its affiliates.\n#\n# This source code is licensed under the MIT license found in the\n# LICENSE file in the root directory of this source tree.\n\"\"\"This module defines a class to represent a compiler environment state.\"\"\"\nimport csv\nimport sys\nfrom typing import Iterable, List, Optional, TextIO\n\nfrom pydantic import BaseModel, Field, validator\n\nfrom compiler_gym.datasets.uri import BenchmarkUri\nfrom compiler_gym.util.truncate import truncate\n\n\nclass CompilerEnvState(BaseModel):\n    \"\"\"The representation of a compiler environment state.\n\n    The state of an environment is defined as a benchmark and a sequence of\n    actions that has been applied to it. For a given environment, the state\n    contains the information required to reproduce the result.\n    \"\"\"\n\n    benchmark: str = Field(\n        allow_mutation=False,\n        examples=[\n            \"benchmark://cbench-v1/crc32\",\n            \"generator://csmith-v0/0\",\n        ],\n    )\n    \"\"\"The URI of the benchmark used for this episode.\"\"\"\n\n    commandline: str\n    \"\"\"The list of actions that produced this state, as a commandline.\"\"\"\n\n    walltime: float\n    \"\"\"The walltime of the episode in seconds. Must be non-negative.\"\"\"\n\n    reward: Optional[float] = Field(\n        required=False,\n        default=None,\n        allow_mutation=True,\n    )\n    \"\"\"The cumulative reward for this episode. Optional.\"\"\"\n\n    @validator(\"walltime\")\n    def walltime_nonnegative(cls, v):\n        if v is not None:\n            assert v >= 0, \"Walltime cannot be negative\"\n        return v\n\n    @validator(\"benchmark\", pre=True)\n    def validate_benchmark(cls, value):\n        if isinstance(value, BenchmarkUri):\n            return str(value)\n        return value\n\n    @property\n    def has_reward(self) -> bool:\n        \"\"\"Return whether the state has a reward value.\"\"\"\n        return self.reward is not None\n\n    def __eq__(self, rhs) -> bool:\n        if not isinstance(rhs, CompilerEnvState):\n            return False\n        epsilon = 1e-5\n        # Only compare reward if both states have it.\n        if not (self.has_reward and rhs.has_reward):\n            reward_equal = True\n        else:\n            reward_equal = abs(self.reward - rhs.reward) < epsilon\n        # Note that walltime is excluded from equivalence checks as two states\n        # are equivalent if they define the same point in the optimization space\n        # irrespective of how long it took to get there.\n        return (\n            self.benchmark == rhs.benchmark\n            and reward_equal\n            and self.commandline == rhs.commandline\n        )\n\n    def __ne__(self, rhs) -> bool:\n        return not self == rhs\n\n    class Config:\n        validate_assignment = True\n\n\nclass CompilerEnvStateWriter:\n    \"\"\"Serialize compiler environment states to CSV.\n\n    Example use:\n\n        >>> with CompilerEnvStateWriter(open(\"results.csv\", \"wb\")) as writer:\n        ...     writer.write_state(env.state)\n    \"\"\"\n\n    def __init__(self, f: TextIO, header: bool = True):\n        \"\"\"Constructor.\n\n        :param f: The file to write to.\n        :param header: Whether to include a header row.\n        \"\"\"\n        self.f = f\n        self.writer = csv.writer(self.f, lineterminator=\"\\n\")\n        self.header = header\n\n    def write_state(self, state: CompilerEnvState, flush: bool = False) -> None:\n        \"\"\"Write the state to file.\n\n        :param state: A compiler environment state.\n\n        :param flush: Write to file immediately.\n        \"\"\"\n        if self.header:\n            self.writer.writerow((\"benchmark\", \"reward\", \"walltime\", \"commandline\"))\n            self.header = False\n        self.writer.writerow(\n            (state.benchmark, state.reward, state.walltime, state.commandline)\n        )\n        if flush:\n            self.f.flush()\n\n    def __enter__(self):\n        \"\"\"Support with-statement for the writer.\"\"\"\n        return self\n\n    def __exit__(self, *args):\n        \"\"\"Support with-statement for the writer.\"\"\"\n        self.f.close()\n\n\nclass CompilerEnvStateReader:\n    \"\"\"Read states from a CSV file.\n\n    Example usage:\n\n        >>> with CompilerEnvStateReader(open(\"results.csv\", \"rb\")) as reader:\n        ...     for state in reader:\n        ...         print(state)\n    \"\"\"\n\n    def __init__(self, f: TextIO):\n        \"\"\"Constructor.\n\n        :param f: The file to read.\n        \"\"\"\n        self.f = f\n        self.reader = csv.reader(self.f)\n\n    def __iter__(self) -> Iterable[CompilerEnvState]:\n        \"\"\"Read the states from the file.\"\"\"\n        columns_in_order = [\"benchmark\", \"reward\", \"walltime\", \"commandline\"]\n        # Read the CSV and coerce the columns into the expected order.\n        for (\n            benchmark,\n            reward,\n            walltime,\n            commandline,\n        ) in self._iterate_columns_in_order(self.reader, columns_in_order):\n            yield CompilerEnvState(\n                benchmark=benchmark,\n                reward=None if reward == \"\" else float(reward),\n                walltime=0 if walltime == \"\" else float(walltime),\n                commandline=commandline,\n            )\n\n    @staticmethod\n    def _iterate_columns_in_order(\n        reader: csv.reader, columns: List[str]\n    ) -> Iterable[List[str]]:\n        \"\"\"Read the input CSV and return each row in the given column order.\n\n        Supports CSVs both with and without a header. If no header, columns are\n        expected to be in the correct order. Else the header row is used to\n        determine column order.\n\n        Header row detection is case insensitive.\n\n        :param reader: The CSV file to read.\n\n        :param columns: A list of column names in the order that they are\n            expected.\n\n        :return: An iterator over rows.\n        \"\"\"\n        try:\n            row = next(reader)\n        except StopIteration:\n            # Empty file.\n            return\n\n        if len(row) != len(columns):\n            raise ValueError(\n                f\"Expected {len(columns)} columns in the first row of CSV: {truncate(row)}\"\n            )\n\n        # Convert the maybe-header columns to lowercase for case-insensitive\n        # comparison.\n        maybe_header = [v.lower() for v in row]\n        if set(maybe_header) == set(columns):\n            # The first row matches the expected columns names, so use it to\n            # determine the column order.\n            column_order = [maybe_header.index(v) for v in columns]\n            yield from ([row[v] for v in column_order] for row in reader)\n        else:\n            # The first row isn't a header, so assume that all rows are in\n            # expected column order.\n            yield row\n            yield from reader\n\n    def __enter__(self):\n        \"\"\"Support with-statement for the reader.\"\"\"\n        return self\n\n    def __exit__(self, *args):\n        \"\"\"Support with-statement for the reader.\"\"\"\n        self.f.close()\n\n    @staticmethod\n    def read_paths(paths: Iterable[str]) -> Iterable[CompilerEnvState]:\n        \"\"\"Read a states from a list of file paths.\n\n        Read states from stdin using a special path :code:`\"-\"`.\n\n        :param: A list of paths.\n\n        :return: A generator of compiler env states.\n        \"\"\"\n        for path in paths:\n            if path == \"-\":\n                yield from iter(CompilerEnvStateReader(sys.stdin))\n            else:\n                with open(path) as f:\n                    yield from iter(CompilerEnvStateReader(f))\n", "path": "compiler_gym/compiler_env_state.py"}], "after_files": [{"content": "# Copyright (c) Facebook, Inc. and its affiliates.\n#\n# This source code is licensed under the MIT license found in the\n# LICENSE file in the root directory of this source tree.\n\"\"\"This module defines a class to represent a compiler environment state.\"\"\"\nimport csv\nimport re\nimport sys\nfrom io import StringIO\nfrom typing import Iterable, List, Optional, TextIO\n\nimport requests\nfrom pydantic import BaseModel, Field, validator\n\nfrom compiler_gym.datasets.uri import BenchmarkUri\nfrom compiler_gym.util.truncate import truncate\n\n\nclass CompilerEnvState(BaseModel):\n    \"\"\"The representation of a compiler environment state.\n\n    The state of an environment is defined as a benchmark and a sequence of\n    actions that has been applied to it. For a given environment, the state\n    contains the information required to reproduce the result.\n    \"\"\"\n\n    benchmark: str = Field(\n        allow_mutation=False,\n        examples=[\"benchmark://cbench-v1/crc32\", \"generator://csmith-v0/0\",],\n    )\n    \"\"\"The URI of the benchmark used for this episode.\"\"\"\n\n    commandline: str\n    \"\"\"The list of actions that produced this state, as a commandline.\"\"\"\n\n    walltime: float\n    \"\"\"The walltime of the episode in seconds. Must be non-negative.\"\"\"\n\n    reward: Optional[float] = Field(\n        required=False, default=None, allow_mutation=True,\n    )\n    \"\"\"The cumulative reward for this episode. Optional.\"\"\"\n\n    @validator(\"walltime\")\n    def walltime_nonnegative(cls, v):\n        if v is not None:\n            assert v >= 0, \"Walltime cannot be negative\"\n        return v\n\n    @validator(\"benchmark\", pre=True)\n    def validate_benchmark(cls, value):\n        if isinstance(value, BenchmarkUri):\n            return str(value)\n        return value\n\n    @property\n    def has_reward(self) -> bool:\n        \"\"\"Return whether the state has a reward value.\"\"\"\n        return self.reward is not None\n\n    def __eq__(self, rhs) -> bool:\n        if not isinstance(rhs, CompilerEnvState):\n            return False\n        epsilon = 1e-5\n        # Only compare reward if both states have it.\n        if not (self.has_reward and rhs.has_reward):\n            reward_equal = True\n        else:\n            reward_equal = abs(self.reward - rhs.reward) < epsilon\n        # Note that walltime is excluded from equivalence checks as two states\n        # are equivalent if they define the same point in the optimization space\n        # irrespective of how long it took to get there.\n        return (\n            self.benchmark == rhs.benchmark\n            and reward_equal\n            and self.commandline == rhs.commandline\n        )\n\n    def __ne__(self, rhs) -> bool:\n        return not self == rhs\n\n    class Config:\n        validate_assignment = True\n\n\nclass CompilerEnvStateWriter:\n    \"\"\"Serialize compiler environment states to CSV.\n\n    Example use:\n\n        >>> with CompilerEnvStateWriter(open(\"results.csv\", \"wb\")) as writer:\n        ...     writer.write_state(env.state)\n    \"\"\"\n\n    def __init__(self, f: TextIO, header: bool = True):\n        \"\"\"Constructor.\n\n        :param f: The file to write to.\n        :param header: Whether to include a header row.\n        \"\"\"\n        self.f = f\n        self.writer = csv.writer(self.f, lineterminator=\"\\n\")\n        self.header = header\n\n    def write_state(self, state: CompilerEnvState, flush: bool = False) -> None:\n        \"\"\"Write the state to file.\n\n        :param state: A compiler environment state.\n\n        :param flush: Write to file immediately.\n        \"\"\"\n        if self.header:\n            self.writer.writerow((\"benchmark\", \"reward\", \"walltime\", \"commandline\"))\n            self.header = False\n        self.writer.writerow(\n            (state.benchmark, state.reward, state.walltime, state.commandline)\n        )\n        if flush:\n            self.f.flush()\n\n    def __enter__(self):\n        \"\"\"Support with-statement for the writer.\"\"\"\n        return self\n\n    def __exit__(self, *args):\n        \"\"\"Support with-statement for the writer.\"\"\"\n        self.f.close()\n\n\nclass CompilerEnvStateReader:\n    \"\"\"Read states from a CSV file.\n\n    Example usage:\n\n        >>> with CompilerEnvStateReader(open(\"results.csv\", \"rb\")) as reader:\n        ...     for state in reader:\n        ...         print(state)\n    \"\"\"\n\n    def __init__(self, f: TextIO):\n        \"\"\"Constructor.\n\n        :param f: The file to read.\n        \"\"\"\n        self.f = f\n        self.reader = csv.reader(self.f)\n\n    def __iter__(self) -> Iterable[CompilerEnvState]:\n        \"\"\"Read the states from the file.\"\"\"\n        columns_in_order = [\"benchmark\", \"reward\", \"walltime\", \"commandline\"]\n        # Read the CSV and coerce the columns into the expected order.\n        for (\n            benchmark,\n            reward,\n            walltime,\n            commandline,\n        ) in self._iterate_columns_in_order(self.reader, columns_in_order):\n            yield CompilerEnvState(\n                benchmark=benchmark,\n                reward=None if reward == \"\" else float(reward),\n                walltime=0 if walltime == \"\" else float(walltime),\n                commandline=commandline,\n            )\n\n    @staticmethod\n    def _iterate_columns_in_order(\n        reader: csv.reader, columns: List[str]\n    ) -> Iterable[List[str]]:\n        \"\"\"Read the input CSV and return each row in the given column order.\n\n        Supports CSVs both with and without a header. If no header, columns are\n        expected to be in the correct order. Else the header row is used to\n        determine column order.\n\n        Header row detection is case insensitive.\n\n        :param reader: The CSV file to read.\n\n        :param columns: A list of column names in the order that they are\n            expected.\n\n        :return: An iterator over rows.\n        \"\"\"\n        try:\n            row = next(reader)\n        except StopIteration:\n            # Empty file.\n            return\n\n        if len(row) != len(columns):\n            raise ValueError(\n                f\"Expected {len(columns)} columns in the first row of CSV: {truncate(row)}\"\n            )\n\n        # Convert the maybe-header columns to lowercase for case-insensitive\n        # comparison.\n        maybe_header = [v.lower() for v in row]\n        if set(maybe_header) == set(columns):\n            # The first row matches the expected columns names, so use it to\n            # determine the column order.\n            column_order = [maybe_header.index(v) for v in columns]\n            yield from ([row[v] for v in column_order] for row in reader)\n        else:\n            # The first row isn't a header, so assume that all rows are in\n            # expected column order.\n            yield row\n            yield from reader\n\n    def __enter__(self):\n        \"\"\"Support with-statement for the reader.\"\"\"\n        return self\n\n    def __exit__(self, *args):\n        \"\"\"Support with-statement for the reader.\"\"\"\n        self.f.close()\n\n    @staticmethod\n    def read_paths(paths: Iterable[str]) -> Iterable[CompilerEnvState]:\n        \"\"\"Read a states from a list of file paths.\n\n        Read states from stdin using a special path :code:`\"-\"`.\n\n        :param: A list of paths.\n\n        :return: A generator of compiler env states.\n        \"\"\"\n        for path in paths:\n            if path == \"-\":\n                yield from iter(CompilerEnvStateReader(sys.stdin))\n            elif (\n                re.match(r\"^(http|https)://[a-zA-Z0-9.-_/]+(\\.csv)$\", path) is not None\n            ):\n                response: requests.Response = requests.get(path)\n                if response.status_code == 200:\n                    yield from iter(CompilerEnvStateReader(StringIO(response.text)))\n                else:\n                    raise requests.exceptions.InvalidURL(\n                        f\"Url {path} content could not be obtained\"\n                    )\n            else:\n                with open(path) as f:\n                    yield from iter(CompilerEnvStateReader(f))\n", "path": "compiler_gym/compiler_env_state.py"}]}